UMI single adjustable control arms: poly/rod end combo, DOM steel.UMI Performance's single adjustable lower control arms combine an polyurethane bushing on one end with a QA1 spherical rod end on the other. This design allows for rear end adjustment and minimizes bind, enhancing handling in high performance situations. Suitable for drag racing, autocross, and street driving, these control arms offer quiet operation thanks to the polyurethane bushings and adjustable length via the QA1 rod end. Constructed from