Aluminum Rear-Rear suspension owner for semi-split bulkheads offer an expanded selection of set-up changes. The aluminum suspension holders work integrated Suspension Settings™ (I.S.S.) enabling for fast & simple suspension system geometry setting. Using eccentric suspension system bushings inserted into aluminum suspension system system holders – also additional suspension system system shims – the XT8 suspension system geometry is completely adjusted in only seconds. Machined from premium Swiss 7075 T6 aluminum and black coated.