Need Assistance from the Vent Window Club

[Vimes]

Still no measurements, I see. I did some more checking and it looks like Steele Rubber might be able to help you out. They do handmade rubber seals, and while they don't say they offer for your truck, it looks like they might be able to help you get something close enough to work. Be worth a shot.

If not, Speedway offers a kit that will let you convert to a wingless window for 150 bucks, and that did come up under a search. But I'd leave that as a last resort. Wing windows are almost as good as air conditioning, especially when you have floor vents to go with them.

Something that was curious to me, CarID (who I don't like recommending to anyone) comes up with a set of wing window seals, Sherman part numbers F4700 and F4701 specifically for the 1974 Courier. It says this one replaces factory part numbers FO1396101 and D3TZ1021449A. But, when you look those part numbers up, they come up as F150 wing windows of the same year range. Might be something that can be cut down, if nothing else.