I ASSUME you want a BYPASS filter like the older cars used, where a small orifice allows a slow flow of oil through the filter, after which it is dumped back into the crankcase?
If so WIX is ONE source.
Have you looked at Hemming's Motor News? typically there's all sorts of ads from outfits that rebuild old car parts and also outfits that sell repro parts such as gas tanks.
Also, Cardone has a rebuild and return service. you can contact them through the website linked below to find a reseller in your area.