John - Stash inspected and perhaps a suitable item found. Will this one do for you??? It'll need a good soaking to dissolve and flush out the remaining years of oil residue and junk in the filter media inside the cap that I couldn't easily dislodge.
It came off a parts engine that is a feeder for my 261 that will be heading to a shop to get a full renewal next week.

Yours for $20 (includes shipping cost) to your homestead. What say you sir?