Check out any of the seven E-11 components enlisted.
The Screw-washer 4x24 is the cheapest item from this partsfiche.
Parts such as the E-11: Screw-washer 4x24, Washer,plain,12mm, Flywheel Comp, Bolt,flange,5x16 are included in the Crf150rb 2009 (9) Japan Ke03-120 E-11 parts fiche.