Dear Kip;
I can't remember where I saw it, but one of the 'big time' custom guys did that in the late 50's or early 60's...
An 'educated guess' would be that a GM door glass is used with It's regulator & the stock glass/hardware is all discarded.
I would start @ a glass shop that has those old paterns. Take with you a cardboard "cutout" of your door glass & wing combined and look for a match. A Cad. Or Olds. (circa 1949) coupe perhaps.
Good luck, John M.......
PS: Let me know how it works out.
