Cessna 120-140 Association

New owner and poster. I noticed in parts book that 1946 and 47/48 engine cowlings have different part numbers. Any chance they are interchangeable? Both my upper and lower are in rough shape.

I'd first contact Univair and ask to speak to someone in their engineering department. They should be able to at least steer you in the right direction. If that fails, try contacting David Lowe in Kentucky, his contact information can be found on AirNav.com under his airport information 80KY.