Left.2 DOOR. Right.2 DOOR. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Floor Side Rail to it's mounting point. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Rocker Panel Reinforcement to it's mounting point. Panel Reinforcement. REINFORCED. Side.