HINSON Urethane (3/8" Drop) Engine Mounts w/Transmission Mounts (Combo - C6 Corvette) Hinson Motorsports Urethane Engine Mounts & Transmission Mounts feature a interlocking stainless steel design. Expect to see drastic improvements in throttle response and reduced driveline movement with these mounts. Direct replacement for stock rubber mounts. Uses factory metric nuts (not included). Our special formulated urethane blend is tuned to provide the optimum experience for both street and track applications. Stainless Steel construction for rust free operation. Made In USA!!