Super-compact rear upright made from specially-formulated graphite composite material features multiple set-up options for upper & lower roll centers.Upper roll center is adjustable via camber linkage & shims − up/down & in/out. Lower roll center is adjustable via eccentric inserts in 9 different positions − up/down & in/out.The race-proven, 2-piece design allows fine-adjustment and increases durability as well as performance. The graphite rear uprights make the car more stable and increases cornering speed as well as overall strength of the car. The uprights are small in size but are very strong due to the special composite mixture used. Suitable for most track conditions, especially for medium- and high-traction tracks.The upright fits on both left & right sides. Must be used with the #325324, #325325 or #325326 drive shafts.