Quote Originally Posted by Fixcinater View Post
That would work with old stock Fuji FP100C45 and the equivalent FP3000B45. Both are discontinued but available in date or just expired online.

New55 should work, and they are just getting into public sales of their product. Pricy at $6/sheet but is new production.
The Polaroid 405 (aka Fujifilm PA-145) works with 3.35x4.25" packs, not the 4x5" packs. Fujifilm FP-100C (no 45) works with it.

The back that takes 4x5" pack is the Polaroid 550 (or Fujifilm PA-45).