I was already looking at Argus's site and was going to order from there but figured I needed to measure the old one too. I'm still debating about if I want the gridded version or the plain version, either would probably be a vast improvement. My Speed Graphic doeesn't have a graflock back It's a spring back. One of the first Top Handle Speed Graphics, so I doubt it has anything as fancy as a fresnal in it.

Also, I'm really confused because the few speed graphic ground glasses I've seen, they're installed "backwards" - with the ground side towards the user instead of towards the lens/bellows. Of course this means the folded fabric has left a sort of X pattern on the ground glass...