1” Transmission Mount Spacer-Block for 1963-2001 GM RWD applications. Works with all GM two-bolt style transmission mounts. Maintaining proper drivetrain geometry with some transmission swaps will sometimes yield a vertical misalignment between the transmission mount and the transmission crossmember. This is often due to variations in transmissions, motor mounts, etc. G Force developed this spacer block to meet the needs of performance builders establishing proper drivetrain geometry. The spacer bolts to your transmission mount and provides solid contact between the transmission mount and transmission crossmember. This spacer is 1” in height, with the slots measuring 1.50" between the centers. Includes two - 2" 7/16-14 bolts.