A sample from the products for the Rear Fork/chain Case include: Bolt,flange,6x22, Arm Rr Brake Stop, Screw,6x12, Washer Fender Set.
The Screw,6x12 is the lowest priced item on this Rear Fork/chain Case schematic.
In this schematic the "Bolt,flange,6x10" is used most often.