Looking for an extension lensboard on a board no wider than 93mm x 93mm. Copal 0. The height of the extension could be 20-80mm, with longer being better. Im going to cut the surrounding board, so I have some flexibility.
I’m not sure what brands might work, but one example would be an extension board for a Horseman FA/HD/HF (80mm x 80mm) and maybe the medium format versions like VH-F.