This could be placed in quite a few different areas here, but since it is 4x5, I went with LF, Move if needed, Thank You. This morning when I came to work I got what seems to be conflicting items. In the mail came a sample package of FujiFilm "Instant Black & White Film, FP-100 B45 Professional 4x5(9x12cm) package 10 prints" This item is listed as "New" on the Fuji USA site http://www.fujifilmusa.com/products/professional_photography/film/fujifilm_instant_films/pack_holder/index.html and as I understand it, you need either the Fuji PA-45 holder or the Polaroid 550 holder. Also this morning I received an email from a distributor listing FujiFilm "FP100B 4x5D" as a returning item and states "replaces Polaroid T54 (req. adapter)" Now it's been quite a while since I have used my Polaroid 4x5 Back, but I thought "T54" was one of the films I was able to use in my 545 holder. The big questions are: Are these two (2) different films? If not, Is there really an adapter to make this pack film work in a 545 holder (can't imagine how)? Also, Can you use a Polaroid 550 holder in place of a 545 for a view camera? Thank you for you cooperation.