Poly Transmission Mount for 200R4 designed for daily driving and for extreme racing conditions, without having to change the stock cross-member. Soft enough to absorb vibrations for street use, yet rugged enough for racing. These mounts also have a unique, metal safety locking feature, effectively controlling torque. This feature delivers the extra strength to resist problematic torque forces. Unfortunately, GM used a rubber version of this mount without any kind of safety locking feature. The interlocking feature of the mount gives you that added confidence against drive train and chassis/frame damage.