The lowest price component in this Crankcase Cover 1 parts-list fiche is the O-ring (2h9).
Parts such as the Crankcase Cover 1: Bolt, Small Flange, Circlip, O-ring (2h9), Gasket, Crankcase Cover 3 (nas) are included in the Wr250f 2001 5ph2 Finland 115ph-100e3 Crankcase Cover 1 parts fiche.
With eight applications this Bolt, Small Flange is the most specified part.