I’m looking for “Graflex” style slotted holders which fit the back on the old SLRs - fixed plate at the bottom, sliding plate at the top. These holders have a vertical groove on the end with the darkslide, and either a groove running the length of the edges for the DDS, or a flanged edge in the case of single sided holders like bag mags, pack film, grafmatic, etc
I’m mostly interested in glass plate or 120 roll film holder, but would consider DDS, grafmatic or bag mags in good condition. Did a plate bag mag even exist for this size?
Here is a sample of the back and holder style: