I swapped out the wing window on my '89 over the weekend ~ to include the frame rail.
The replacement I pulled from the pick'n pull didn't have the felt guide in the rail.

When I went to pull mine... it was dried out and crumbled. ** but usable for a couple months of summer ~ maybe.

From what I've found online, it runs 25 and up per window for the felt rail liners.
More for the felt trim that runs front to back...
And based on the one I need to change, I'd bet all 4 doors are in need. But I don't have an extra 100 + to order all new.

Are there generic felt runners?
... and what about the trim lines?
............or is it time to do a hunt and peck at the local junkyards?