Upper Control Arm, DOM, On-car Adj, Poly Bushing, 9" HousingLaunching harder, reducing wheel hop, and adding cornering consistency to your 9 inch equipped 2011 2014 Ford Mustang is easy with an upper control arm from BMR Suspension. Stock control arms with soft rubber bushings deflect under load and absorb power instead of transferring it to the tires. BMRs polyurethane, on car adjustable tubular control arm for S197 Mustangs (UTCA034) is manufactured from heavy duty 1 5 8 inch, 0. 120 inch wall DOM steel