Bump. I know it's been forever and this is an odd accessory apparently but if you've got one let me know. Using roll film in this old thing would be fun!
It would be helpful to know which of the dozen or more plate holder mounting styles the camera has, in order to suggest a compatible roll film holder. There were holders that would fit multiple camera-side mounts, and a (very) few cameras that could take more than one kind of holder. A good closeup of the edge of one of the plate holders, at the dark slide end, or of the camera back corresponding, would help a lot here.
It would be helpful to know which of the dozen or more plate holder mounting styles the camera has, in order to suggest a compatible roll film holder. There were holders that would fit multiple camera-side mounts, and a (very) few cameras that could take more than one kind of holder. A good closeup of the edge of one of the plate holders, at the dark slide end, or of the camera back corresponding, would help a lot here.