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