If so why should i mention it? have enough argued back and forth about that back even before i had it. maybe that was a mistake.
can attach whatever is working. only dont yet have the focusing panel.
the only real advantage i see is using it with expensive instant film. new55(b+w) or the possible Color neg-pos.

will use that back anyway in a different way since i dont have and dont want the needed camera. pacemaker crown graphic.
NB: once had a toyo 45C with 210 nikkor and sliding back for mamiya press. but that was 30 years ago and more a toy at that time. never used 4x5 film.
could mount the dividing back on Polaroid MP3 but slit must then be enlarged from 5.7 to 7mm.