HINSON Urethane Engine Mounts (3/8" Drop Mounts) C5 Corvette C6 Corvette GTO Hinson Urethane Engine Mounts (3/8" Drop Mounts). Tuned for both street and track applications. Reason For Shorter Mounts: Corvette cowl clearance due to FAST intake. GTO stearing shaft to header clearance. Replace your stock rubber mounts for improved throttle response and reduced engine movement. Stainless steel construction for rust free operation. Interlocking design for fail safe operation. Direct replacement for stock rubber mounts. Uses factory metric nuts (not included).