Okay, Bill, you were thinking of the 500 series films that fit the 550 holder, not the 50/70 that fit 500/545/545i, or the 660 series in the 405. BTW, Fuji still sells films that fit the 550, so if you have one, don't scrap it yet.
Also worthy of note, apparently the old 3x4 film packs would drop right into a Polaroid camera or film back that accepts 660 series films, though I don't know how you'd go about advancing them -- might just pull all the tabs out where the single tab emerges in the Polaroid, though you'd be likely to damage something trying to tear the tabs off.
Certainly seems as if there'd be a market for film packs (the fellow who found a pallet of Tri-X 4x5 film packs in a warehouse somewhere doesn't seem to have had any trouble selling them off despite being 20 years expired), and heaven knows the adapters are easy to come by. Maybe some dealer like J&C Photo could get some of their house-brand 120 film stock cut to pack film dimensions and mated up to backing paper. Get the work done in China or India, and you might well be able to make the film competitive with big name sheet film in singles. Cut and load it in 4x5 and 9x12 cm to start, and then branch out if there's demand...
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