Firmer bushings provide greater control and increased cornering capacity and feel. Non adjustable replacement bushings. (Item number 6 in the parts diagram) One kit does both left and right sides of vehicle. Whiteline Synthetic Elastomer Bushings: After extensive development and testing of materials that would offer strength and durability, geometry retention and memory without the harshness, WHITELINE has created a progressive, long-chain Synthetic Elastomer that delivers the combined physical advantages of solid bushings, with the extreme flexibility characteristics of rubber.