Parts such as the Crankcase Cover: Rivet (183-15448-00), Screw Pan Head, Cover, Generator (1), Cover,generator 2 are included in the Cs3b 1970 Usa Crankcase Cover parts fiche.
The Rivet (183-15448-00) is the lowest priced item on this Crankcase Cover schematic.
On this parts fiche the Screw Pan Head is the most specified component.