Unless you have a stash of (actual Polariod product) Polaroid film in either size, you'll be paying through the nose for long-expired, most likely faded beyond recognition film.
However, Fujifilm STILL makes "120" sized medium-format pack film, and there are Polaroid/Fuji backs designed to take these packs.
I use the Fuji FP100C(asa 100, color) regularly, and it's a wonderful product. I sorely miss their FP-100B(black and white, 100asa) product though, as do many others...
-Dan