Rear Suspension Kit, Polyurethane, Non AdjustableLaunching harder, reducing wheel hop, and adding cornering consistency to your 1968 1972 GM A body is easy with a Rear Suspension Kit from BMR Suspension. Stock stamped steel control arms with soft rubber bushings deflect under load and absorb power instead of transferring it to the tires. BMRs polyurethane, non adjustable Rear Suspension Kit (RSK017) consists of lower control arms, upper control arms, and control arm reinforcement braces.