SuperSprings Mounting Kits and poly spring pad mounting blocks are used as a fulcrum centered underneath SuperSprings. They sit on top of the factory spring pack assembly underneath the SuperSprings. They act to elevate, insulate, and anchor the SuperSprings to the factory spring assembly. The mounting kit should only be used for specified SuperSprings applications. Check your vehicle type to ensure correct fit. Never load any vehicle beyond the manufacturers GVWR. Only use with specified SuperSprings applications Maintenance-free Sold as a pair (left & right) | Supersprings International Inc SuperSprings P1KT Mounting Kit for Various SuperSprings Applications, Pair