For FP-100B, FP-100C, and FP3000B use the Fuji PA-145 or a Polaroid 405 holder. The holder is smaller than a 4x5 back, but it fits a 4x5 camera.
For FP-100B45, FP-100C45, and the like you'd use a Fuji PA-45 or Polaroid 550 back. These fit snugly on most cameras and too tightly on others. There is no wiggle room or play like on a 145/405.
I should add that if you don't have any experience loading these backs you should look up a video tutorial. I'm not saying it's rocket science, but the "tab" comes out a different slot than the film does and getting that all sorted out cost me a few shots. Then I had someone show me what I was supposed to do and I slapped myself on the forehead.



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