Aluminum back Lower Suspension Holder REAR for semi-split bulkheads offer an expanded selection of set-up adjustments. The aluminum suspension system holders function built-in Suspension Settings™ (I.S.S.) makes it possible for for quick & easy suspension system geometry setting. Making use of eccentric suspension bushings placed into aluminum suspension holders – in addition to extra suspension system shims – the XB8 suspension system geometry is entirely adjusted in mere seconds. Machined from premium Swiss 7075 T6 aluminum and black colored coated.