Aluminum back Lower Suspension Holder BACK for semi-split bulkheads provide an expanded choice of set-up corrections. The aluminum suspension system holders function Integrated Suspension Settings™ (I.S.S.) enabling for quick & effortless suspension system system geometry environment. Using eccentric suspension bushings put into aluminum suspension holders – including extra suspension system shims – the XB8 suspension system geometry are totally modified in just seconds. Machined from premium Swiss 7075 T6 aluminum and black coated.