BMR 64-72 A-Body Upper Non-Adj. A-Arms w/ Stock Spindles (Polyurethane) - Black HammertoneThe polyurethane bushings add strength and reduce deflection over the stock rubber bushing, while still absorbing much of the NVH. The means you get a great blend of performance and comfort. Designed for street A arms are one of the most important, yet overlooked suspension components. They are the direct link between the front wheels and the chassis. Any deflection causes a change in alignment, which results in poor performance and driving feel.