I am working on a comprehensive cross reference to post on our website (www.proscca.com).
If anyone has a filter that they have actually used and tested successfully please email me or post the manufacturer and part number here (plus any links to detail information at the mfg's site).
I'll update the post when complete. Currently we have 7 filters we beleive to be compatible.
The NAPA 7035 is probably the most widely used and tested.
Thanks,
Jeff