There is air cleaner info here that may be of help, but no part numbers. http://www.nicksgarage.com/aircleaner.htm

I looked in my 1967 parts catalog. There are 10 (yes, ten ) part #s for 4 barrel air cleaners. It depends on engine size, no snorkel, 1 snorkel or 2 snorkel.

Can you narrow it down some?