Parts such as the Muffler: Cover,muffler, Muffler Assembly, Clamp, Pipe,exhaust Coupler are included in the Gs450et 1981 (x) Usa (e03) Muffler parts fiche.
The Muffler is made up of components including this Muffler Assembly which is the most expensive.
The Lock Washer is the cheapest item from this partsfiche.