Engine cradle bolt. Left.#4. PartQualifier: #4. Right.#4. A Bolt used to secure a Suspension Shock Absorber. An exhaust Bolt is a specialized fastener designed to secure various components of an exhaust system, including the manifold, catalytic converter, and exhaust pipes. Axle Hub Mounting Bolt. Catalytic Converter Bolt. Engine Mount Bolt. Exhaust Manifold Bolt. Part cannot be reused/reinstalled. Suspension Crossmember Bolt.