HINSON Urethane Engine Mounts (OEM Height) C5 Corvette C6 Corvette GTO Hinson Motorsports Urethane Engine Mounts features an interlocking stainless steel design. Our special formulated urethane blend is tuned to provide the optimum experience for both street and track applications. Expect to see drastic improvements in throttle response and reduced driveline movement with these engine mounts. Stainless steel construction for rust free operation. Direct replacement for stock rubber mounts. Uses factory metric nuts (not included).