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