On this parts fiche the Bolt,flange,6x35 is the most specified component.
A sample from the products for the Left Crankcase Cover - Generator include: Screw,cross 6x12, Bolt,flange,12x40, Cover,l.crankcase, Bolt,flange,6x35.
The component with the lowest price in the LEFT CRANKCASE COVER - GENERATOR schematic is the Screw,cross 6x12.