Lower shaft lower bolt. An exhaust Bolt is a specialized fastener designed to secure various components of an exhaust system, including the manifold, catalytic converter, and exhaust pipes. Bolt used to fasten the Steering Shaft. Starter Bolt. Steering Column Universal Joint Bolt. /SCREW. Coupling. Exhaust. Intermed. Mount. Muffler AND pipe. Starter. Steering Column U - Joint. Yoke.