Suncore's rear gas shock absorbers are direct replacement parts that fit into the existing suspension system and mountin brackets without the need to modify or reposition fittings. The gas charged shock provides an OE style ride and provides the extension support your rear air or coil springs need. If your car is swaying around corners, bottoming out at speed bumps, or sagging on one side or the other, your shocks may need to be replaced. Even if the springsw are damaged it is wise to replace the shocks for a premium ride quality and to improve reliability.