In this schematic the "Bolt,flange,8x27" is used most often.
The most reasonably priced component used on the Gl1500c Valkyrie 1998 (w) Australia / Rbm Final Driven Gear is the Bolt,hex.,6x12.
Some items from this specific schematic: Bolt,flange,8x27, Cap,breather, Spacer F,ring, Spacer A,ring.