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 - 35450, 35475, 35495