Ok, it's a bit confusing.... Are you wanting to replace/repair the rubber seal just around the small vent window? Or the rubber around the entire window assembly?
That entire window is constructed with a metal frame, then the rubber is molded around it. Essentially it's all one piece. There is no way to replace the rubber "gasket" like the other windows.
If you have tears you're trying to repair, use some of that liquid rubber grip stuff you can dip tool handles into - just brush it on over the tears and let it set up.
When you re-install the window, run a bead of weather strip adhesive in the gap of the rubber that seals to the body just before you install it.
If you're just looking to repair the rubber seal around the small vent window....... that's a good question. I've never looked at that seal to see if it's separate from the rest of the rubber molded to the window assembly..... :dunno:
Seems to me I've seen 1/4" x 1/4" square foam weather strip with adhesive on one side available at the auto parts stores or residential window stores. You could stick that to the existing rubber seal so that when the window is latched, it presses the weather strip tight........
