Straight back anti-roll club for ball-bearing roll club mounting system works together with right back suspension system system hands. The anti-roll club system is set up towards straight back bulkheads via bearings from outside for extra-smooth motion as well as for quick & easy 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 & effortless. Anti-roll club has laser-engraved stripes (corresponding to club degree) for effortless recognition. Works extremely well with #303434 Aluminum Anti-Roll Bar Bushing o2.0mm - 6mm (2) Fits X4 & X4F