Parts such as the Muffler: Clamp,exhaust Pipe, Bolt, Cover,muffler,right, Clamp are included in the Gs1100gk 1982 (z) Usa (e03) Muffler parts fiche.
The Lock Washer is the cheapest item from this partsfiche.
This schematic depicts all components used in the Gs1100gk 1982 (z) Usa (e03) Muffler partslist.