I first ran into this problem when I was shooting with the 35mm pano back on my Bronica SQa. I figured it’s the same length as a 6×6 fame, just a different height. I found extremely difficult to print 35mm panoramic (24mmx55mm) negatives in a 6×6 negative carrier. The reason why is coming up in a second. The solution was to get a panoramic negative carrier for my Beseler 23C.
Fast forward a few years and I make the exact same assumption and mistake when I got a Holga 120Pan Which