Found my dads original 1971 duster!

dads71 said
I think you’re right. These dart doors were supposed to have the triangle piece of glass up front. Probably worse case scenario. Lol

Yeah couldn't get much worse. I do believe I know where a pair of doors are here in Toronto. A lot of work and expense to re-do but might be better off in the long run. I'm gonna see if they're still available just in case.