SuperPro DURO4425K SuperPro DuroBall Front Lower Control Arm Inner Rear Bushing Set - Subaru VA WRX & STISuperPro DURO4425K SuperPro DuroBall Front Lower Control Arm Inner Rear Bushing Set Subaru VA WRX & STI Control arm bushings form the vital pivot and link between all core suspension components. SuperPro increases the performance and precision over traditional elastomer bushings with the compound DuroBall bushing assembly. Using an isolated spherical bearing encased in polyurethane provides the precision and articulation of a bearing design with the