The lowest price component in this Fenders parts-list fiche is the Nut,flanged,6mm.
On this parts fiche the Bolt, 6x22 is the most specified component.
A sample from the products for the Fenders include: Nut,flanged,6mm, Fender-rear,fr, Fender-comp-rear,rr,c, Bolt, 6x22.
