The information that quick loads or any other modern holders will fit that back s incorrect. Go to
www.graflex.org for the straight scoop on these things. I specialize in Speed Graphic and I'd like to think I know what I'm talking about. You can easily change the entire back for something more modern. It's a simple swap, with no mods necessary.
Edit: I just re-read your post, and yes, the back off your old Speed Graphic, if it's the same format (ie 4X5) will exchange. Just remove the screws that hold it to the camera and exchange. Should be two little screws at the very top and two or three at the very bottom. Some later ones have a screw under the focus panel, at the light trap groove. A ten minute conversion.
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