There are a couple of ways that you can go on the verticle runs. You can buy the strips with the metal channel, drill out the rivets, remove the old one and rivet the new channel in place.
The felt is available, and to replace just the felt, you will need to strip out the old felt using a knife or screwdriver. Once you have the old felt out, you can glue the new felt into place. I use 3M trim adhesive. Either way you will want to pull the vent window assembly out of the door.
Jim
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