On this parts fiche the Pin,dowel (137) is the most specified component.
This schematic depicts all components used in the Xs650 1979 Usa Shifter 1 Xs650d/e/e006501~/f partslist.
The Shifter 1 Xs650d/e/e006501~/f is made up of components including this Shift Cam Assy which is the most expensive.