Thats real clever Jim! but for those intrested? I've found that a NAPA oil filter for a 1979 CADDILAC COUPE DEVILLE WITH A 425 ENGINE has the same threads that screw to the filter boss, and it also has a perfect match for the rubber gasket as well! (these particular filters are narrow and longer than the actual filter part number that comes up that is shorter and larger in diameter, which often interferes with the rear header tube.) HOPE THIS HELPS.
