The O-ring (11h) is the lowest priced item on this Crankcase Cover 1 schematic.
On this parts fiche the Bolt, Small Flange is the most specified component.
The Yfm35fxk 1998 Usa Except California Maine New Hampshire Crankcase Cover 1 consists of twenty-nine pieces with the Cover, Crankcase 1 being the most expensive.