Does anyone use the Fuji film like the FP100c with the Polaroid 545 holder?

Just lurking around and saw your post.

A little late so you probably already have your answer. For the sake of others that may wonder the same thing, the Fujifilm FP100c is actually a 3 1/4 x 4 1/4 size and compatible with the Polaroid 405 back and would not work with the 545 or 545i. I use this combination frequently to check lighting ratio and exposure B4 I load up the really expensive film.

Fuji makes an FP100-45c/b which I am wondering is compatible with the 545i.

The PA-45 adapter is equivalent to the old Polaroid 550 holder and will not work with the single sheet holders Polaroid made (ie 500,545 and its variants)