Rear lower left suspension arm made from super-tough composite material that is exclusively used for suspension arms, a perfect balance between reliability and performance. The suspension arm itself is rigid enough to provide a responsive feel, yet soft enough to provide extreme durability.The arms feature innovative Suspension Flex Adjustment (SFA). Whether racing in low- or high-traction track conditions, you can easily adjust the flex of the arms by quickly and easily adding/removing optional graphite stiffeners to change the stiffness of the suspension. The new arms include 4 holes where the optional graphite stiffeners are mounted, and the areas around the holes are strengthened for maximum durability. New arm design allows for very practical variable positioning of the rear shocks. Depending on track conditions, the rear shocks can be installed either in front of or behind the shock tower, and the rear shock tower can be placed either in front of or behind the bulkhead. Note: The V2 version does not fit the #363190 Graphite Rear Lower Arm Plate 1.6mm (L+R).