Right back anti-roll club for ball-bearing roll bar mounting system works together with back suspension arms. The anti-roll club system is mounted towards rear bulkheads via bearings from outside for extra-smooth movement as well as for quick & simple alterations and adjustment. The roll club turns in ball-bearings for optimum precision and free movement. Anti-roll bar height is adjustable via a screw... fast & effortless. Anti-roll club has laser-engraved stripes (corresponding to club level) for effortless recognition. Must be used with #303434 Aluminum Anti-Roll Bar Bushing o2.0mm - 6mm (2) Fits X4 & X4F