Aluminum back Lower Suspension Holder BACKSIDE for semi-split bulkheads provide an expanded array of set-up alterations. The aluminum suspension holders function integrated Suspension Settings™ (I.S.S.) that allows for quick & easy suspension system geometry environment. Utilizing eccentric suspension system system bushings placed into aluminum suspension system holders – plus extra suspension system shims – the XB8 suspension system geometry is totally modified in only moments. Machined from premium Swiss 7075 T6 aluminum and black colored coated.