Straight back anti-roll club for ball-bearing roll club mounting system works together with straight back suspension system arms. The anti-roll club system is set up towards back bulkheads via bearings from outside for extra-smooth movement and for fast & simple alterations and modification. The roll club turns in ball-bearings for maximum accuracy and free motion. 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. May be used with #303434 Aluminum Anti-Roll Bar Bushing o2.0mm - 6mm (2) Fits X4 & X4F