1953 F250 rear window glass

[Stoker280]

Does anyone know the size of the glass for the rear window on the F250. I had a window cut but it seems a little big. I want to try and give the glass tech a proper measurement. I tried making a template but it definitely wasn’t perfect. I am thinking of removing an 1/8th all the way around. If I had a measurement … my guess work work be simpler