pullayup: I think what you're looking for is called a focusing panel.
run"monty: AKA focusing screen
pullayup: It's been a while, but I think the camera back you're talking about is "Graflok" style (after the Graflex cameras, which introduced it) or an "international (spring) back". Specifically, you're looking for the ground glass focusing insert, which is removed and replaced with the film holder after you've focused.
Venadium: I'm not sure what you're looking for actually exists, and if it does, is still produced today. Your best bet may be to just repurpose a film holder like in the photo you posted. What kind of camera(s) are you using that would require such a holder?
I mean, it sounds like he knows what he's doing ...
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