Saving Old Seagulls

Hello, all.
My old petcock's fine filter screen has long ago expired. Is there a practical replacement available or is it on to an external filter?

Thanks.

All my collection is gone. Thanks for the inquiries.

This is for USA-based interested parties, shipping these is unrealistic.

I was an avid Seagull collector several years ago and acquired many motors, roughly twenty, an example of most models, large and small blocks, with intent to eventually restore. Most of them are in need-to-restore condition ...