Energy Suspension 3.4171R Supplemental Body Mount KitEnergy Suspension 3. 4171R Supplemental Body Mount Kit Will replace distorted and worn out original rubber mounts to maintain car body and truck cab to bed alignment. Original rubber mounts are so soft they often crack, distort, and crush so badly they often fall off! And aluminum body mounts are too harsh for street use that they tend to break and cause other components to break. Energys specially formulated Hyper Flex(TM) polyurethane cab and body