I need to know the XL's "standard distance" from, say the back of the four-pin mounting plate to the film plane. This figure must exist somewhere to allow all the backs to be made.
I have several Brooks Veriwide XL's with differing lenses, Polaroid and 545 backs; all four film planes are at different distances. I hope to get the collection up to spec. and move on to a XL RF to profit from current investment in supports.
Otherwise I will just decide my own spec. and get on with life.

Thanks, if you can help.

bert mcclure