Aluminum lower suspension owner for the REAR for the front suspension system. Redesigned to go the inner pivot location closer to the car center enabling to make use of longer and shorter suspension system supply options and new suspension geometry. The narrower design increases back traction. The aluminum suspension holders function Integrated Suspension Settings (I.S.S.) allowing for quick & easy suspension geometry set-up. Machined from premium Swiss 7075 T6 aluminum and black colored coated. Using eccentric suspension system bushings inserted into aluminum suspension system obstructs, along with additional suspension system shims, the XB4 suspension geometry may be totally adjusted.