This Next Generation sealed, maintenance-free adjustable ball joint replacement is the evolution of ball joint design. Upgrade or replace worn ball joints on your SPC Performance Adjustable Upper Control Arms with these revolutionary new joints. Designed, engineered and assembled in Colorado, these next generation ball joints are the result of a relentless pursuit of perfection and performance. This complete service kit includes a pair of ball joints, retaining clips, castle nuts, cotter pins and (x2) forged inserts for applications that use oversized or aftermarket knuckles. Replaces Ball Joint on SPC Arms - 25460, 25485