On this parts fiche the Screw-washer,4x16 is the most specified component.
The Carburetor Optional Parts Kit assembly is constructed from several parts from which the Parts.kit,carb is the most expensive.
A sample from the products for the Carburetor Optional Parts Kit include: Jet,main,#178, Jet,slow #58, Jet,main (#168), Screw-washer,4x16.