I use this on my '50 3100. You can find them on ebay now and then.
It originally used an oil impregnated mesh filter rather than an oil bath filter. It came to me with the paper filter and I just left it the way it is. I've since found out that the oiled mesh filters are available from the restoration suppliers.
It's 6 inches in diameter and the 216 breathes just fine with it.
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)