WK21 - 1950-70 1" Wheel Cylinder Repair Set

WK21 - 1950-70 1" Wheel Cylinder Repair Set


In Stock Now!

MSRP: $7.99 set
$6.99  set


WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

1950-70 1" Wheel Cylinder Repair Set

Our wheel cylinder rebuild set is an exact match to the design of your vehicle's original equipment.

Features:
  • Saves you money and restores your wheel cylinder
  • Designed to meet OE quality, configuration, and fitment
  • Includes spring, cup seals and dust boots
  • Made of high-quality materials for long lasting performance

Note: One set required per cylinder.

Buick Applications:
  • 1954 - 1958 Buick Century (rear wheels)
  • 1976 - 1976 Buick Electra (rear wheels)
  • 1970 - 1976 Buick Estate Wagon (rear wheels)
  • 1959 - 1963 Buick Invicta (rear wheels)
  • 1959 - 1990 Buick LeSabre (rear wheels)
  • 1958 - 1958 Buick Limited (rear wheels)
  • 1965 - 1976 Buick Riviera (rear wheels)
  • 1950 - 1996 Buick Roadmaster (rear wheels)
  • 1954 - 1954 Buick Skylark (rear wheels)
  • 1964 - 1964 Buick Sklyark (front wheels)
  • 1950 - 1963 Buick Special (rear wheels)
  • 1965 - 1969 Buick Sportwagon (front wheels)
  • 1950 - 1958 Buick Super (rear wheels)
  • 1963 - 1970 Buick Wildcat (rear wheels)
Cadillac Applications:
  • 1987 - 1992 Cadillac Brougham (rear wheels)
  • 1965 - 1966 Cadillac Calais (rear wheels)
  • 1995 - 1996 Cadillac Commercial Chassis (rear wheels)
  • 1965 - 1966 Cadillac DeVille (rear wheels)
  • 1976 - 1996 Cadillac Fleetwood (rear wheels)
  • 1937 - 1938 Cadillac Series 60 (rear wheels)
  • 1938 - 1940 Cadillac Series 60 Special (rear wheels)
  • 1939 - 1951 Cadillac Series 61 (rear wheels)
  • 1940 - 1964 Cadillac Series 62 (rear wheels)
  • 1941 - 1941 Cadillac Series 63 (rear wheels)
  • 1937 - 1938 Cadillac Series 65 (rear wheels)
  • 1941 - 1941 Cadillac Series 67 (rear wheels)
  • 1950 - 1964 Cadillac Series 75 Fleetwood (rear wheels)
Chevrolet Applications:
  • 1953 - 1975 Chevrolet Bel Air (rear wheels)
  • 1958 - 1970 Chevrolet Biscayne (rear wheels)
  • 1958 - 1959 Chevrolet Brookwood (rear wheels)
  • 1967 - 1996 Chevrolet Caprice (rear wheels)
  • 1962 - 1963 Chevrolet Chevy II/Nova (front wheels)
  • 1962 - 1964 Chevrolet Corvair (fornt wheels)
  • 1961 - 1964 Chevrolet Corvair (rear wheels)
  • 1953 - 1965 Chevrolet Corvette (rear wheels)
  • 1958 - 1958 Chevrolet Del Ray (rear wheels)
  • 1959 - 1960 Chevrolet El Camino (rear wheels)
  • 1958 - 1982 Chevrolet Impala (rear wheels)
  • 1958 - 1958 Chevrolet Yeoman (rear wheels)
Chevrolet Truck Applications:
  • 1954 - 1954 Chevrolet 1500 (rear wheels)
  • 1961 - 1961 Chevrolet C10 Pickup (rear wheels)
  • 1975 - 1984 Chevrolet C10 (rear wheels)
  • 1975 - 1975 Chevrolet K10 (rear wheels)
  • 1974 - 1974 Chevrolet C/K20 Pickup (rear wheels)
  • 1987 - 1987 Chevrolet R/V20 (rear wheels)
  • 1967 - 1974 Chevrolet K10 Suburban (rear wheels)
  • 1971 - 1984 Chevrolet C10 Suburban (rear wheels)
  • 1974 - 1986 Chevrolet C20 Suburban (rear wheels)
  • 1976 - 1986 Chevrolet K20 Suburban (rear wheels)
  • 1987 - 1987 Chevrolet R/V20 Suburban (rear wheels)
Chrysler Applications:
  • 1950 - 1951 Chrysler New Yorker (rear wheels)
  • 1950 - 1950 Chrysler Royal (rear wheels)
  • 1951 - 1952 Chrysler Saratoga (rear wheels)
Dodge Truck Applications:
  • 1981 - 1993 Dodge B150 (rear wheels)
  • 1978 - 1980 Dodge B200 (rear wheels)
  • 1981 - 1993 Dodge B250 (rear wheels)
  • 1973 - 1974 Dodge B300 Van (rear wheels)
  • 1981 - 1994 Dodge B350 (rear wheels)
  • 1978 - 1989 Dodge D100 (rear wheels)
  • 1978 - 1993 Dodge D150 (rear wheels)
  • 1975 - 1980 Dodge D200 (rear wheels)
  • 1981 - 1993 Dodge D250 (rear wheels)
  • 1972 - 1974 Dodge D300 Pickup (rear wheels)
  • 1981 - 1993 Dodge D350 (rear wheels)
  • 2000 - 2004 Dodge Dakota (rear wheels)
  • 2000 - 2002 Dodge Durango (rear wheels)
  • 2000 - 2002 Dodge Ram 1500 (rear wheels)
  • 1997 - 2002 Dodge Ram 1500 Van (rear wheels)
  • 1996 - 2002 Dodge Ram 2500 (rear wheels)
  • 1996 - 2002 Dodge Ram 2500 Van (rear wheels)
  • 1994 - 2002 Dodge Ram 3500 (rear wheels)
  • 1996 - 2002 Dodge Ram 3500 Van (rear wheels)
  • 1973 - 1974 Dodge RM300 (rear wheels)
  • 1984 - 1989 Dodge W100 (rear wheels)
  • 1978 - 1993 Dodge W150 (rear wheels)
  • 1975 - 1980 Dodge W200 (rear wheels)
  • 1981 - 1993 Dodge W250 (rear wheels)
  • 1978 - 1980 Dodge W300 (rear wheels)
  • 1981 - 1993 Dodge W350 (rear wheels)
Ford Applications:
  • 1969 - 1970 Ford Custom (rear wheels)
  • 1969 - 1977 Ford Custom 500 (rear wheels)
  • 1969 - 1974 Ford Galaxie 500 (rear wheels)
  • 1972 - 1975 Ford Gran Torino (rear wheels)
  • 1991 - 1991 Ford Grand Marquis (rear wheels)
  • 1969 - 1978 Ford LTD (rear wheels)
  • 1977 - 1977 Ford LTD II (rear wheels)
  • 1990 - 1991 Ford LTD Crown Victoria (rear wheels)
  • 1972 - 1978 Ford Ranchero (rear wheels)
  • 1972 - 1976 Ford Thunderbird (rear wheels)
  • 1972 - 1976 Ford Torino (rear wheels)
Ford Truck Applications:
  • 1984 - 2002 Ford E-150 Econoline (rear wheels)
  • 1984 - 1999 Ford E-150 Econoline Club Wagon (rear wheels)
  • 2003 - 2004 Ford E-250 (rear wheels)
  • 1976 - 1991 Ford E-250 Econoline Club Wagon (rear wheels)
  • 1979 - 1992 Ford E-350 Econoline (rear wheels)
  • 1984 - 1992 Ford E-350 Econoline Club Wagon (rear wheels)
  • 1984 - 2001 Ford F-150 (rear wheels)
  • 1965 - 1999 Ford F-250 (rear wheels)
  • 1968 - 1992 Ford F-350 (rear wheels)
GMC Truck Applications:
  • 1951 - 1959 GMC 100 (rear wheels)
  • 1954 - 1959 GMC 150 (rear wheels)
  • 1966 - 1966 GMC 1000 (rear wheels)
  • 1979 - 1984 GMC C1500 (rear wheels)
  • 1979 - 1984 GMC C1500 Suburban (rear wheels)
  • 1979 - 1986 GMC C/K2500 (rear wheels)
  • 1979 - 1986 GMC C/K2500 Suburban (rear wheels)
  • 1979 - 1980 GMC G1500 (rear wheels)
  • 1979 - 1980 GMC G3500 (rear wheels)
  • 1966 - 1966 GMC P1000 (rear wheels)
  • 1987 - 1987 GMC R/V2500 (rear wheels)
  • 1987 - 1987 GMC R/V2500 Suburban (rear wheels)
    • Lincoln Applications:
      • 1941 - 1979 Lincoln Continental (rear wheels)
      • 1972 - 1974 Lincoln Mark IV (rear wheels)
      Mercury Applications:
      • 1972 - 1972 Mercury Comet (rear wheels)
      • 1974 - 1977 Mercury Cougar (rear wheels)
      • 1975 - 1991 Mercury Grand Marquis (rear wheels)
      • 1969 - 1978 Mercury Marquis (rear wheels)
      • 1949 - 1951 Mercury Mercury (rear wheels)
      • 1972 - 1976 Mercury Montego (rear wheels)
      • 1950 - 1974 Mercury Monterey (rear wheels)
      • 1939 - 1939 Mercury Series 99A (rear wheels)
      Oldsmobile Applications:
      • 1954 - 1956 Oldsmobile 88 (rear wheels)
      • 1971 - 1992 Oldsmobile Custom Cruiser (rear wheels)
      • 1965 - 1976 Oldsmobile Delta 88 (rear wheels)
      • 1961 - 1963 Oldsmobile F85 (rear wheels)
      • 1977 - 1978 Oldsmobile Omega (rear wheels)
      • 1960 - 1960 Oldsmobile Super 88 (rear wheels)
      • 1964 - 1972 Oldsmobile Vista Cruiser (front wheels)
      Packard Applications:
      • 1955 - 1955 Packard Caribbean (rear wheels)
      • 1957 - 1957 Packard Clipper (rear wheels)
      • 1955 - 1956 Packard Four-Hundred (rear wheels)
      • 1957 - 1957 Packard Hawk (rear wheels)
      • 1954 - 1958 Packard Packard (rear wheels)
      • 1955 - 1956 Packard Patrician (rear wheels)
      Pontiac Applications:
      • 1957 - 1967 Pontiac Bonneville (rear wheels)
      • 1959 - 1976 Pontiac Catalina (rear wheels)
      • 1949 - 1958 Pontiac Chieftain (rear wheels)
      • 1939 - 1940 Pontiac Deluxe Series 26 (rear wheels)
      • 1939 - 1940 Pontiac Deluxe Series 28 (rear wheels)
      • 1963 - 1967 Pontiac Grand Prix (rear wheels)
      • 1959 - 1986 Pontiac Parisienne (rear wheels)
      • 1977 - 1977 Pontiac Phoenix (rear wheels)
      • 1987 - 1989 Pontiac Safari (rear wheels)
      • 1940 - 1940 Pontiac Special Series 25 (rear wheels)
      • 1955 - 1966 Pontiac Star Chief (rear wheels)
      • 1946 - 1951 Pontiac Streamliner (rear wheels)
      • 1957 - 1958 Pontiac Super Chief (rear wheels)
      • 1946 - 1948 Pontiac Torpedo (rear wheels)
      • 1940 - 1940 Pontiac Torpedo Series 29 (rear wheels)
      • 1960 - 1977 Pontiac Ventura (rear wheels)
      Studebaker Applications:
      • 1954 - 1958 Studebaker Champion (rear wheels)
      • 1955 - 1966 Studebaker Commander (rear wheels)
      • 1965 - 1966 Studebaker Cruiser (rear wheels)
      • 1966 - 1966 Studebaker Daytona (rear wheels)
      • 1956 - 1956 Studebaker Flight Hawk (rear wheels)
      • 1956 - 1958 Studebaker Golden Hawk (rear wheels)
      • 1956 - 1956 Studebaker Power Hawk (rear wheels)
      • 1955 - 1958 Studebaker President (rear wheels)
      • 1956 - 1956 Studebaker Sky Hawk (rear wheels)
      • 1957 - 1958 Studebaker Silver Hawk (rear wheels)
      • 1966 - 1966 Studebaker Wagonaire (rear wheels)

This product fits the following vehicle applications. Click to view individual years.

Product Specifications

Shipping Dimensions
  • Weight: 0 Lbs, 1 Oz
  • Dimensions: L: 3" x W: 3" x H: 2"
  • Ship Type: Standard |
Product Information
1950-70 1" Wheel Cylinder Repair Set

Our wheel cylinder rebuild set is an exact match to the design of your vehicle's original equipment.

Features:
  • Saves you money and restores your wheel cylinder
  • Designed to meet OE quality, configuration, and fitment
  • Includes spring, cup seals and dust boots
  • Made of high-quality materials for long lasting performance

Note: One set required per cylinder.

Buick Applications:
  • 1954 - 1958 Buick Century (rear wheels)
  • 1976 - 1976 Buick Electra (rear wheels)
  • 1970 - 1976 Buick Estate Wagon (rear wheels)
  • 1959 - 1963 Buick Invicta (rear wheels)
  • 1959 - 1990 Buick LeSabre (rear wheels)
  • 1958 - 1958 Buick Limited (rear wheels)
  • 1965 - 1976 Buick Riviera (rear wheels)
  • 1950 - 1996 Buick Roadmaster (rear wheels)
  • 1954 - 1954 Buick Skylark (rear wheels)
  • 1964 - 1964 Buick Sklyark (front wheels)
  • 1950 - 1963 Buick Special (rear wheels)
  • 1965 - 1969 Buick Sportwagon (front wheels)
  • 1950 - 1958 Buick Super (rear wheels)
  • 1963 - 1970 Buick Wildcat (rear wheels)
Cadillac Applications:
  • 1987 - 1992 Cadillac Brougham (rear wheels)
  • 1965 - 1966 Cadillac Calais (rear wheels)
  • 1995 - 1996 Cadillac Commercial Chassis (rear wheels)
  • 1965 - 1966 Cadillac DeVille (rear wheels)
  • 1976 - 1996 Cadillac Fleetwood (rear wheels)
  • 1937 - 1938 Cadillac Series 60 (rear wheels)
  • 1938 - 1940 Cadillac Series 60 Special (rear wheels)
  • 1939 - 1951 Cadillac Series 61 (rear wheels)
  • 1940 - 1964 Cadillac Series 62 (rear wheels)
  • 1941 - 1941 Cadillac Series 63 (rear wheels)
  • 1937 - 1938 Cadillac Series 65 (rear wheels)
  • 1941 - 1941 Cadillac Series 67 (rear wheels)
  • 1950 - 1964 Cadillac Series 75 Fleetwood (rear wheels)
Chevrolet Applications:
  • 1953 - 1975 Chevrolet Bel Air (rear wheels)
  • 1958 - 1970 Chevrolet Biscayne (rear wheels)
  • 1958 - 1959 Chevrolet Brookwood (rear wheels)
  • 1967 - 1996 Chevrolet Caprice (rear wheels)
  • 1962 - 1963 Chevrolet Chevy II/Nova (front wheels)
  • 1962 - 1964 Chevrolet Corvair (fornt wheels)
  • 1961 - 1964 Chevrolet Corvair (rear wheels)
  • 1953 - 1965 Chevrolet Corvette (rear wheels)
  • 1958 - 1958 Chevrolet Del Ray (rear wheels)
  • 1959 - 1960 Chevrolet El Camino (rear wheels)
  • 1958 - 1982 Chevrolet Impala (rear wheels)
  • 1958 - 1958 Chevrolet Yeoman (rear wheels)
Chevrolet Truck Applications:
  • 1954 - 1954 Chevrolet 1500 (rear wheels)
  • 1961 - 1961 Chevrolet C10 Pickup (rear wheels)
  • 1975 - 1984 Chevrolet C10 (rear wheels)
  • 1975 - 1975 Chevrolet K10 (rear wheels)
  • 1974 - 1974 Chevrolet C/K20 Pickup (rear wheels)
  • 1987 - 1987 Chevrolet R/V20 (rear wheels)
  • 1967 - 1974 Chevrolet K10 Suburban (rear wheels)
  • 1971 - 1984 Chevrolet C10 Suburban (rear wheels)
  • 1974 - 1986 Chevrolet C20 Suburban (rear wheels)
  • 1976 - 1986 Chevrolet K20 Suburban (rear wheels)
  • 1987 - 1987 Chevrolet R/V20 Suburban (rear wheels)
Chrysler Applications:
  • 1950 - 1951 Chrysler New Yorker (rear wheels)
  • 1950 - 1950 Chrysler Royal (rear wheels)
  • 1951 - 1952 Chrysler Saratoga (rear wheels)
Dodge Truck Applications:
  • 1981 - 1993 Dodge B150 (rear wheels)
  • 1978 - 1980 Dodge B200 (rear wheels)
  • 1981 - 1993 Dodge B250 (rear wheels)
  • 1973 - 1974 Dodge B300 Van (rear wheels)
  • 1981 - 1994 Dodge B350 (rear wheels)
  • 1978 - 1989 Dodge D100 (rear wheels)
  • 1978 - 1993 Dodge D150 (rear wheels)
  • 1975 - 1980 Dodge D200 (rear wheels)
  • 1981 - 1993 Dodge D250 (rear wheels)
  • 1972 - 1974 Dodge D300 Pickup (rear wheels)
  • 1981 - 1993 Dodge D350 (rear wheels)
  • 2000 - 2004 Dodge Dakota (rear wheels)
  • 2000 - 2002 Dodge Durango (rear wheels)
  • 2000 - 2002 Dodge Ram 1500 (rear wheels)
  • 1997 - 2002 Dodge Ram 1500 Van (rear wheels)
  • 1996 - 2002 Dodge Ram 2500 (rear wheels)
  • 1996 - 2002 Dodge Ram 2500 Van (rear wheels)
  • 1994 - 2002 Dodge Ram 3500 (rear wheels)
  • 1996 - 2002 Dodge Ram 3500 Van (rear wheels)
  • 1973 - 1974 Dodge RM300 (rear wheels)
  • 1984 - 1989 Dodge W100 (rear wheels)
  • 1978 - 1993 Dodge W150 (rear wheels)
  • 1975 - 1980 Dodge W200 (rear wheels)
  • 1981 - 1993 Dodge W250 (rear wheels)
  • 1978 - 1980 Dodge W300 (rear wheels)
  • 1981 - 1993 Dodge W350 (rear wheels)
Ford Applications:
  • 1969 - 1970 Ford Custom (rear wheels)
  • 1969 - 1977 Ford Custom 500 (rear wheels)
  • 1969 - 1974 Ford Galaxie 500 (rear wheels)
  • 1972 - 1975 Ford Gran Torino (rear wheels)
  • 1991 - 1991 Ford Grand Marquis (rear wheels)
  • 1969 - 1978 Ford LTD (rear wheels)
  • 1977 - 1977 Ford LTD II (rear wheels)
  • 1990 - 1991 Ford LTD Crown Victoria (rear wheels)
  • 1972 - 1978 Ford Ranchero (rear wheels)
  • 1972 - 1976 Ford Thunderbird (rear wheels)
  • 1972 - 1976 Ford Torino (rear wheels)
Ford Truck Applications:
  • 1984 - 2002 Ford E-150 Econoline (rear wheels)
  • 1984 - 1999 Ford E-150 Econoline Club Wagon (rear wheels)
  • 2003 - 2004 Ford E-250 (rear wheels)
  • 1976 - 1991 Ford E-250 Econoline Club Wagon (rear wheels)
  • 1979 - 1992 Ford E-350 Econoline (rear wheels)
  • 1984 - 1992 Ford E-350 Econoline Club Wagon (rear wheels)
  • 1984 - 2001 Ford F-150 (rear wheels)
  • 1965 - 1999 Ford F-250 (rear wheels)
  • 1968 - 1992 Ford F-350 (rear wheels)
GMC Truck Applications:
  • 1951 - 1959 GMC 100 (rear wheels)
  • 1954 - 1959 GMC 150 (rear wheels)
  • 1966 - 1966 GMC 1000 (rear wheels)
  • 1979 - 1984 GMC C1500 (rear wheels)
  • 1979 - 1984 GMC C1500 Suburban (rear wheels)
  • 1979 - 1986 GMC C/K2500 (rear wheels)
  • 1979 - 1986 GMC C/K2500 Suburban (rear wheels)
  • 1979 - 1980 GMC G1500 (rear wheels)
  • 1979 - 1980 GMC G3500 (rear wheels)
  • 1966 - 1966 GMC P1000 (rear wheels)
  • 1987 - 1987 GMC R/V2500 (rear wheels)
  • 1987 - 1987 GMC R/V2500 Suburban (rear wheels)
    • Lincoln Applications:
      • 1941 - 1979 Lincoln Continental (rear wheels)
      • 1972 - 1974 Lincoln Mark IV (rear wheels)
      Mercury Applications:
      • 1972 - 1972 Mercury Comet (rear wheels)
      • 1974 - 1977 Mercury Cougar (rear wheels)
      • 1975 - 1991 Mercury Grand Marquis (rear wheels)
      • 1969 - 1978 Mercury Marquis (rear wheels)
      • 1949 - 1951 Mercury Mercury (rear wheels)
      • 1972 - 1976 Mercury Montego (rear wheels)
      • 1950 - 1974 Mercury Monterey (rear wheels)
      • 1939 - 1939 Mercury Series 99A (rear wheels)
      Oldsmobile Applications:
      • 1954 - 1956 Oldsmobile 88 (rear wheels)
      • 1971 - 1992 Oldsmobile Custom Cruiser (rear wheels)
      • 1965 - 1976 Oldsmobile Delta 88 (rear wheels)
      • 1961 - 1963 Oldsmobile F85 (rear wheels)
      • 1977 - 1978 Oldsmobile Omega (rear wheels)
      • 1960 - 1960 Oldsmobile Super 88 (rear wheels)
      • 1964 - 1972 Oldsmobile Vista Cruiser (front wheels)
      Packard Applications:
      • 1955 - 1955 Packard Caribbean (rear wheels)
      • 1957 - 1957 Packard Clipper (rear wheels)
      • 1955 - 1956 Packard Four-Hundred (rear wheels)
      • 1957 - 1957 Packard Hawk (rear wheels)
      • 1954 - 1958 Packard Packard (rear wheels)
      • 1955 - 1956 Packard Patrician (rear wheels)
      Pontiac Applications:
      • 1957 - 1967 Pontiac Bonneville (rear wheels)
      • 1959 - 1976 Pontiac Catalina (rear wheels)
      • 1949 - 1958 Pontiac Chieftain (rear wheels)
      • 1939 - 1940 Pontiac Deluxe Series 26 (rear wheels)
      • 1939 - 1940 Pontiac Deluxe Series 28 (rear wheels)
      • 1963 - 1967 Pontiac Grand Prix (rear wheels)
      • 1959 - 1986 Pontiac Parisienne (rear wheels)
      • 1977 - 1977 Pontiac Phoenix (rear wheels)
      • 1987 - 1989 Pontiac Safari (rear wheels)
      • 1940 - 1940 Pontiac Special Series 25 (rear wheels)
      • 1955 - 1966 Pontiac Star Chief (rear wheels)
      • 1946 - 1951 Pontiac Streamliner (rear wheels)
      • 1957 - 1958 Pontiac Super Chief (rear wheels)
      • 1946 - 1948 Pontiac Torpedo (rear wheels)
      • 1940 - 1940 Pontiac Torpedo Series 29 (rear wheels)
      • 1960 - 1977 Pontiac Ventura (rear wheels)
      Studebaker Applications:
      • 1954 - 1958 Studebaker Champion (rear wheels)
      • 1955 - 1966 Studebaker Commander (rear wheels)
      • 1965 - 1966 Studebaker Cruiser (rear wheels)
      • 1966 - 1966 Studebaker Daytona (rear wheels)
      • 1956 - 1956 Studebaker Flight Hawk (rear wheels)
      • 1956 - 1958 Studebaker Golden Hawk (rear wheels)
      • 1956 - 1956 Studebaker Power Hawk (rear wheels)
      • 1955 - 1958 Studebaker President (rear wheels)
      • 1956 - 1956 Studebaker Sky Hawk (rear wheels)
      • 1957 - 1958 Studebaker Silver Hawk (rear wheels)
      • 1966 - 1966 Studebaker Wagonaire (rear wheels)

Vehicle Fitment

This product fits the following vehicle applications. Click to view individual years.

Specifications

Product Specifications

Shipping Dimensions
  • Weight: 0 Lbs, 1 Oz
  • Dimensions: 3" x 3" x 2"
  • Ship Type: Standard |


  • Product #:
  • SHIP TYPE:
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

This product fits the following vehicle applications. Click to view individual years.

Shipping Dimensions