You can purchase new prebent lines for not a lot of money from just about anybody - NPD, Classic Industries, Classic Chevy Trucks, Jim Carter, etc

They run along the passenger frame rail. There should be a couple clips there.

That's if it's the same as a 1950.

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)