On this parts fiche the Bolt, Flange(4kg) is the most specified component.
The Xg250 2005 4d62 Belgium 1d4d6-352s1 Crankcase Cover 1 consists of thirty pieces with the Cover, Crankcase 1 being the most expensive.
Some items from this specific schematic: Bolt, Flange(4bh), Plug, Straight Screw(2gv), Bolt, Flange(4as), Bolt, Hexagon Socket Head.