SPC Performance Replacement Ball Joint & Knuckle Insert Kit (Use w/ PN 25460 or 25485 )Upgrade or replace worn ball joints on SPC Performance Adjustable Upper Control Arms with these modern architecture, maintenance free, adjustable units. Designed, engineered and assembled in Colorado, these next generation ball joints are the result of a relentless pursuit of product performance and longevity. These ball joints are reverse compatible and a direct replacement for the SPC upper control arm sets. Replaces Ball Joint on SPC Arms 25460,