NOS MOPAR PART # 4198637 WEATHER STRIP / RUBBER SEAL | eBay
I tried to get it for a more reasonable price because of its age, so I could use it to figure out the exact size to buy a new aftermarket equivalent, but the seller and I couldn't agree on a price.
Maybe someone else won't be as cheap as I am lol. I checked this in both my 83 and 89 parts books. It's definitely front door glass channel run.