Steve, the big risk with taking a #00 from a folder is tube length. They're not all the same and SAs are sensitive to spacing. Measure carefully.

I have the impression that post-WW II Compur 00s are pretty standard. So are Prontor Press #00s, remember that these are all post-war.

I have a couple of lenses in Prontor #00, including a 47/5.6 SA that Schneider shipped in one. eBay #180812990726 has one with a 50/4 Comparon in it. I'd been thinking of bidding but don't really need another #00 so will stand aside and let others vie for it.