I picked up a Crown Graphic from a listing here on APUG that has a spring back. Assuming the screws line up on the spring and Graflok backs, I'd like to find a Graflok back for it so I can use my pack film backs (3x4 and 4x5), and roll film backs that I use on my Cambo.
I have one I can sell but the focus panel has no ground glass/Fresnel or shade. I could also sell just the frame with no focus panel at all. It'll work fine if you'll only be using the rangefinder.