1964-1972 GM A-Body GM A-Body Tubular Lower Control Arms Hotchkis Sport Suspension 1104 1964-1972 GM A-Body Tubular Lower Control Arms. Install the Geometry Corrected Hotchkis Tubular Lower A-Arms on your 64-72 GM A-Body including Chevelle El Camino GTO and 442 and gain vastly increased handling and control. These TIG-welded bolt-on control arms offer ride height adjustment for ultimate performance and a great look regardless of engine and transmission combinations. Smooth operating Delrin bushings allow the control arms to move through their travel easily. Finished in gloss black powder coat the arms are ready to install and are complete with ball joints bump stops ride height shims polyurethane coil spring locators and Delrin bushings.