Left.2013-15. Mount bracket bolt. Right.2013-15. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Driveshaft Center Support Bracket to its mounting surface. An exhaust Bolt is a specialized fastener designed to secure various components of an exhaust system, including the manifold, catalytic converter, and exhaust pipes. Exhaust System Hanger Bolt. Fuel Tank Bolt. Drive Shaft Center. Exhaust System Hanger. Fuel Tank. Mount Bracket. Prop Shaft Center.