This kit replaces both the rear upper and lower rear control arms on any 78-87 GM G-Body. Kit is designed to reduce traction loss and minimize wheel hop found with stock control arms. Included with this kit includes (1) set of boxed lower control arms and (1) set of our on-car adjustable upper control arms, “Ultimate Arms”. Both items are direct replacements of the OEM set up adding strength, ride improvement and most importantly, rear end adjustment. Kit Includes: 1 Set- Tubular Lower Control Arms- Item # 3021 1 Set- Adjustable Upper Control Arms- Item # 3017