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I can only tell you the data on 48-50's that we've gathered re: vins shows no big windows on even the late serial numbered 50's. So I doubt it was changed as part of the normal production run.
Replacement cabs is a concept I have never considered and probably is what we have here.
Thanks for the info, Chuck. That makes perfect sense. I looked through my catalog trying to find the listing for a complete cab to see if it had any notes like the cab back panel, but couldn't find it. Would you know what the part number is, or if it's even in the catalog?
I have only ever seen part numbers listed for complete cabs in the Canadian Body Catalogue. They list cabs and panel truck bodies, painted and trimmed. Cab part # is C7C-8100000. I would guess the US part # would be 7C-8100000. I never found a listing for a bare cab in any of the catalogs, but I know they could be ordered. Like I said, I have actual seen NOS cabs, so they did exist. Must have been some kind of a special order.
Chuck