I'm sanding on a new stock for my 1957 model 37 and need to get some dimensions as to the size at the butt plate. How tall by how wide at center. The previous owner put a (shudder) pistol grip on this old girl, so I have no old stock to measure from. It's a 12 ga. Once I get the specs I'll have this girl back to her former glory. Anybody wanna help me out here?