Aluminum back Lower Suspension Holder REAR for semi-split bulkheads provide an expanded selection of set-up changes. The aluminum suspension system holders feature incorporated Suspension Settings™ (I.S.S.) allowing for quick & simple suspension geometry setting. Using eccentric suspension system bushings placed into aluminum suspension holders – also additional suspension system shims – the XB8 suspension geometry could be entirely adjusted in only seconds. Machined from premium Swiss 7075 T6 aluminum and black colored coated.