The catalog number of the Graflex back grafmatics is #1168 and the graphic back grafmatics are #1268. Also, the graphic (or grafloc) back grafmatics will say "45 Graphic" on them, the Graflex back models will say "45 Graflex" on them. Of course all this info would be all you need IF you were buying them new, but you're not, so it's always best to look at the side where it mounts onto the camera to determine what kind of holder it is, as over the years people have mixed & matched parts. The Graflex back versions don't have a ridge on them for the light seal, but rather a groove, and they're also larger in the film's short side than a normal Graphic version.

With an unmodified Graflex back camera, you can use grafmatics, or the bag mags. Bag mags came before grafmatics, and while they appear to be harder to use, they're just slightly different, once you get the hang of them, they can be just as fast as a grafmatic, and they hold either 12 or 18 shoots! The normal bag mag will hold 12 sheets of film, the plate version with the proper film septums can hold 18 shots.

Really the only reason you would want to modify a Graflex to have a grafloc back would be if you're using Polaroid backs, and IMHO using Polaroid film in an RB Super D is a waste of a good camera!

-Mike