On this parts fiche the Screw-pan Head,6x20 is the most specified component.
Some items from this specific schematic: Oil Seal Sc25376, Crankcase Set, Screw-pan Head,6x40, Screw-pan Head,6x65.
thirty-seven components are shown in this G5b 1974 Canada Crankcase ('72-'73 G5-a) exploded diagram.