Left. Lower bracket screw. Right. A Bolt used to attach the Frame Side Member Reinforcement to its mounting point. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Engine Mount Support Bracket to it's mounting point. and Washer Assembly. and Washer Assembly - HEX. HEAD. Engine Mount Support. Frame Side Member Reinforcement. Screw.