On this parts fiche the Bolt,6x16 is the most specified component.
The most reasonably priced component used on the Ar80c5 1987 Usa / Mph Fender is the Bolt-upset-ws.
A sample from the products for the Fender include: Fender-front,p.white, Collar,6.5x8.5x3, Reinforce,rear Fender, Bolt,6x14.