I'll probably get "spanked" for this reply,but here goes- That cab design started in '67,for the medium-duty G.M.C.'s,and was used (I.M.H.O.),on the "Brigadiers", (not sure about the "Generals),up into the mid-'80's. If,in fact your truck cab was mfd. in '65,it's gotta be a rare bird. G.M.C. was a little ahead of Chevrolet,in the cab department,(on a few models),especially in the mid '60's. The only difference between a pick-up cab,of this time frame,and a big truck cab,is the split windshield,and the doors have a cut-out at the bottom front corners,for fender clearance. There may be other differences,but it's been 30 years,since I drove a "Brig". Check the wrecking yards for later model "Brig"'s and "Generals". They may be easier to find parts for. Hope this helps.
