Just plain 35mm full frame.
I've used a few for scanning badly curved film (washi film). And on one occasion, an improvised wet scanning holder, very effective for a badly scratched film from the family archive.
For that reason, and if there are such requests, I also offer to send one or two in an envelope.
Mounts spoken for. Pending payment of shipping.
Mounts go to Anon Ymous
Single/pairs of mounts still available for scanning damaged film, as explained above.