Molded-composite left rear upright features built-in 1° of outboard toe-in to improve the rotation of the car in corners and prevent suspension geometry changes in serious crashes. Features two roll center positions on the top of the rear upright. Accommodates small but robust 5x10 ball-bearings for minimized unsprung weight.
Medium rigidity (labeled “M”) specially optimized for rubber-tire racing.
Use with matching right-side rear upright 303351. Can be also used for foam tires.