Backside anti-roll club for ball-bearing roll club mounting system works together with straight back suspension system system fingers. The anti-roll club system is established toward back bulkheads via bearings from outside for extra-smooth movement as well as for fast & effortless alterations and modification. The roll club turns in ball-bearings for maximum precision and free movement. Anti-roll club height is adjustable via a screw... fast & simple. Anti-roll club has laser-engraved stripes (corresponding to club degree) for simple recognition. Functions well with #303434 Aluminum Anti-Roll Bar Bushing o2.0mm - 6mm (2) Fits X4 & X4F