On this parts fiche the Bolt,head Cover is the most specified component.
The most reasonably priced component used on the Crf250r 2004 (4) Japan Me10-100.101 E-1 is the Bolt.flang 6x12.
This schematic depicts all components used in the Crf250r 2004 (4) Japan Me10-100.101 E-1 partslist.