Check out any of the eight Left Crankcase Cover components enlisted.
Some items from this specific schematic: Bolt,flange,6x50, Gasket,l.crankcas (nas), Gasket,l Cover (nas), Cover,left Crank.
The Bolt,flange,6x35 is the most widely applied product in the CRF100F 2008 (8) AUSTRALIA LEFT CRANKCASE COVER ( four times ).