You might try Classic Exhaust Systems but I doubt anybody is going to have a bolt on kit for a '58 GMC truck.

Unless you have the original exhaust pieces to take to an exhaust shop to use as templates, you're probably going to have to load up the chassis and haul it to the shop.

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)