The Bilstein 24-187374 B8 5100 series shock absorber is a premium 46mm monotube gas-pressure shock designed specifically for lifted trucks and SUVs. This rear shock provides superior control and performance both on-road and off-road. Features include a zinc-plated finish for durability and a unique velocity-sensitive digressive piston that reacts to changing road conditions. This is a single unit; for a complete axle set, please order two units. Components included: 1x Shock Absorber (24-187374), 1x Bushing Kit, 1x Installation Hardware Set, 1x Protective Boot.