Do you mean the soft strip that presses against the OUTSIDE or the INSIDE of the window? Or some other thing entirely?
I had the OUTSIDE strips replaced on mine. Had the dealer do it because I don't have the tools or experience to mess around with door panels, drilling out rivets, etc. The INSIDE strips are screwed in and easier, or so I'm told.
you dont need to remove the window, just the door panel, when you get that off it will make sense, when you get the new seals they should come with rivets, if not, just take the old one or use a drill bit to get the diameter and get some, you can use screws but rivets work alot better in this situation. Like I said, once you get in there it will make sense, I replaced both sides on the 89 I had and Im not a mechanic by no means.
How did it look with the window up? I dont remember how I had the windows, it was a long time ago. I do know that I didnt have to take anything off other then the door panels and being real careful with the drill. I'll check the manuals when I leave work to make sure.