Gabriel G63783 Ultra Truck Shock for select Chevrolet Silverado/GMC Sierra models Orifice Disk with variable nine-stage valving provides consistent oil flow G-Force technology for quicker response, improved product life, and consistent, reliable ride and control Stable Steer valving provides response from all four corners for a stable, safe ride G-Force piston is bonded iron construction for durability and longer life, along with the heavy duty compression head valve that withstands extreme impact This item is not for sale in Catalina Island