The Bolt,hex.,6x10 is the lowest priced item on this Left Crankcase Cover schematic.
This Cover,l,crankcase is the most expensive of the items that make up this Left Crankcase Cover assembly.
Some items from this specific schematic: O Ring 27.4-2.4, Bolt,hex.,6x10, Cap,30mm, Bolt,flange Sh 6x65.