The most reasonably priced component used on the Xg250 2005 4d61 Greece 1d4d6-300e1 Crankcase Cover 1 is the O-ring (2h9).
The Crankcase Cover 1 assembly is constructed from several parts from which the Cover, Crankcase 1 is the most expensive.
Some items from this specific schematic: O-ring (646), Crankcase Cover Assy 3, Clamp, Gasket 256113960000 (nas).