These are the new replacements for the big and small block engine mounts for the 1963-72 chevy and GMC trucks. This unique mount bolts up from under the motor tower. A single center bolt retains the mount to the frame. Anyone with a high horsepower application needs these. We have also had these designed with an interlocking feature to still hold the engine in the case of a cushion failure. These are in black urethane. For side bolt style mounts use part# sbmm72ur