3627 - 1978-1996 GM B-Body Boxed Lower Control Arms- w/ Dual Roto-JointsUMI's boxed lower control arms feature Roto Joint technology for a smooth and bind free performance, providing a comfortable ride. The control arms are constructed from 0. 120 wall thickness rectangular tubing, with CNC machined bushing holders and MIG welded end caps to keep out debris. They are designed to accommodate both stock and aftermarket rear sway bars, with reinforced sway bar holes for added strength. The Roto Joints eliminate arm flex and