As Jiri said, the film pack adapter is useless because film in packs hasn't been made for decades.
I take it that the cameras are Graphics (Speed or Crown).
Sheet film is loaded into film holders (in UK English, dark slides for ones that are one-sided and hold one sheet, double dark slides for ones that are double-sided and hold two sheets) that slip into the camera between the gate (back of the box) and focusing panel. Graflok and Graphic are different types of back of box/focusing panel. The Graflok focusing panel can easily be removed from the camera and replaced by a roll film holder, the Graphic is permanently attached so isn't very compatible with, e.g., Graphic 23 roll holders that are made to attach to Graflok backs.
If you're going to use a roll holder, play with the 2x3 camera. It is smaller and lighter than the 3x4. And roll holders for both shoot the same size image.
Good luck, have fun,
Dan
If the cameras are Graphics, visit
www.graflex.org and take a good look around. Read the FAQs, ...
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