When I bought my 1931 chevy, the air cleaner was completely missing. The last owner, a vintage-car-garage, tried to tell me "cars like this have no air cleaner in general"...ridiculous.
So i began to search for one and found:
http://cgi.ebay.com/ebaymotors/Air-...ategoryZ43946QQihZ023QQitemZ360097776824(Just to give you an idea in case of "I need it now, tomorrow")
Yes, it is not original, but it fits and works and after one week the car was ready for use and I could drive this summer without ruining the engine.
All the best
Stefan from germany