Battery bolt. A/C Compressor 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. Battery Hold Down Bolt. Exhaust Muffler Bolt. Exhaust System Hanger Bolt. Air Conditioning (A/C). Battery Hold Down. Crossmember. Exhaust System Hanger. Mount bracket. Muffler AND pipe. SCR Assembly - HX HD Flat Washer.