Parts such as the Muffler: Connector,muffler, Pipe,exhaust Ctr, Screw 5x20, Lock Washer are included in the Gs750b 1978 (c) Usa (e03) Muffler parts fiche.
The lowest price component in this Muffler parts-list fiche is the Lock Washer.
On this parts fiche the Bolt is the most specified component.