SPC Performance Chevrolet Corvette C2/C3 Adjustable Upper Control Arms (Pair)This unique, patented design provides the most adjustability and best clearance of any arm available for the '63 '82 GM Corvette and '65 '70 Impala applications. Sold as a pair, these forged steel adjustable arms come with ball studs that are 1 2" taller than stock to improve camber curve. Dial in some caster combined with the ability to adjust camber, yields a truly 'modern' feeling suspension. The ball joints are greaseable and fully rebuildable.