The most reasonably priced component used on the Crf50f 2011 (a) Australia Generator is the Bolt,hex.,5x6.
A sample from the products for the Generator include: Flywheel Comp.(mi, Oil Seal 18.9x5, Bolt,flange,6x22, Stator Comp.(nd).
In this schematic the "O-ring,6x1.7" is used most often.