BMR 64-72 A-Body Non-Adj. Boxed Lower Control Arms (Polyurethane) - RedLaunching harder, reducing wheel hop, and adding cornering consistency to your GM A body is easy with lower control arms from BMR's suspension. BMRs polyurethane, non adjustable boxed control arms for A bodies are the ultimate in strength. Stock stamped steel control arms with soft rubber bushings deflect under load and absorb power instead of transferring it to the tires. CNC laser cut from heavy duty 1. 5 x3 inch, 0. 120 inch wall boxed steel