Super-compact rear upright made from HARD super-tough, high-tech composite material features multiple set-up options for upper & lower roll centers.Upper roll center is adjustable via camber linkage & shims â“ up/down & in/out. Lower roll center is adjustable via eccentric inserts in 9 different positions â“ up/down & in/out.The race-proven, 2-piece design allows fine-adjustment and increases durability as well as performance. Molded from HARD composite â“ this upright is suitable for most track conditions, especially low- and medium-traction tracks.The upright fits on both left & right sides. Must be used with the Must be used with the #325324, #325325 or #325326 drive shafts.