I replaced both of the vent window seals. They are a pain. I have a write up on around here somewhere. I removed the two rivets on the hinge to reinstall the vent window gasket. After all that work, the passenger side worked but the drivers side didn't. The drivers side still had bad wind noise and leaked water.
I went ahead and bought a new vent assembly through Captkaos. I looked at the new one I received and the old one I tried to fix. I just couldn't get the gasket to "sit" just right in the old vent window. I used plenty of soapy water to try and coax the gasket into place - but I guess it didn't work.
I have learned to remove these vent windows quickly now

It certainly was a good learning experience.