Straight back anti-roll club for ball-bearing roll club mounting system and redesigned to work well with the X4 right back suspension system arms. The anti-roll bar system is installed toward right 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 screwââ¬Â¦ fast & easy. Anti-roll club has laser-engraved stripes (corresponding to bar thickness) for simple recognition.