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I have not had to replace the vent window on a 73-79, but I did recently have to replace on a 96 F150 and an 83 GMC.
I found it easier to just replace the entire assembly
The 96 took about 20 minutes sitting in a parking lot waiting for my wife who had gone in a store for only five minutes. Then I only had to wait another hour for her
The about the same amount of time. I can't imagine that our trucks would be that much different
Just noticed your post, if your in Calgary give me a post, Ive got the parts your looking for. I'm not a retailer but I have a couple of stripped down doors.