Developed for the C4 Corvette, SuperPro's rear control arm bushings offer a huge upgrade in performance and service live with no trade-offs in comfort or compliance. Our materials and designs offer a lifetime of maintenance-free performance. Please note:- This kit fits both the upper and lower control rods.- Two bushing assemblies are included in a single kit. - To replace the rearward bushings in BOTH the upper and lower control rods you will need to purchase two kits Control arm bushes stabilize the movement of the arms to ensure the correct geometry is maintained in all situations. Worn or rubber bushes in these locations lead to dynamic changes in wheel alignment that effect the handling of a vehicle as well as the tire life. SuperPro Bushings solve this issue and are the perfect repair or repair upgrade solution.