The most reasonably priced component used on the Rm85 2010 (l0) Usa (e03) Rear Fender is the Bolt,6x20.
On this parts fiche the Washer(6.5x20x1.2) is the most specified component.
This schematic depicts all components used in the Rm85 2010 (l0) Usa (e03) Rear Fender partslist.