I don't think type 5 holders are the right kind, as they are graphic, which is different from graflex. Here are some pictures from the
Pacific Rim website illustrating the difference:
The type on the bottom is the kind I need, notice the grooves.
The one on the left is the kind of roll holder I'd need. It also has the same grooves as the sheet holders, you can't see them in this picture.
If you have any of these kinds of backs send me a PM with your info, thanks Al Dawe.