HINSON Urethane C5 Corvette Transmission Mount C5 Z06 Corvette C5 Internal Interlocking Fail Safe Urethane Transmission Mount. This urethane transmission mount is designed for a great balance between transmission control and vibrations. Tuned for both street and track applications. Replace your stock rubber mount for improved throttle response and reduced driveline movement. Direct replacement for stock rubber mount. Uses factory metric nuts (not included). Stainless Steel construction for rust free operation.