Found 1 other number, CA313, to add to that list, but most of the numbers I have found cross back to the K&N filter-E1960.
Here's another site you can order a few filters also. http://store.cobranda.com/ovairclas.html

It's a Ford/Cobra site, but has the same type of Air Cleaners availiable. Just call the tech line and tell them the dimensions you need and they'll help you out. Found 1 link that had 6 filters for $80 on their site- http://store.cobranda.com/ovairfisixpa.html

I still think the www.bfwebexpress.com/catalog.asp page with the baldwin PA632 filter is the best deal so far. Only you have to order over $50 worth of anything to have them ship it. But a case (6) is only $64.39 there. YMMV...