On this parts fiche the Bolt,flanged,6x12 is the most specified component.
The Rear Fender(s) is made up of components including this Reinforce which is the most expensive.
A sample from the products for the Rear Fender(s) include: Screw,6x14, Fender-rear,rr, Screw,tapping,5x10, Damper,10x45,t1.0.
