I wouldn't worry too much about that. I bet they're after market replacements. Everybody was doing fiberglass parts in the 1970s for cost and weight reasons. Heck, modern trucks are practically all fiberglass.

You might be able to stiffen them up by layering fiberglass on the inside.

Fiberglass fenders makes your truck even more unique.


1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)