I was able to get a minute to work the gasket into place and with some heat: presto!
It took a bit of massaging with the heat gun, and then I had to use my plastic pick to get the rim proper on the base of this mirror.
Then, I brought my triangle (vent) glass and frame over to the bench and hit the channels with some soapy water, and assembled the new seal ...
Then I said (to myself) ... why not, put the felt guide in there....
Now, I have to start putting the mess back into the door shell.
I still (really) do not like working with that 3M weatherstrip adhesive. It gets everywhere. I have to install that lower door seal sooner or later....and also finish off that targa bar seal.