Not sure if I got the right seal figured out but if it's the one for the door window that fallows down the track to hold and seal the glass as you roll it up and down. (if that makes sense)
Yea you can just roll the window down and stuff that felt molding down as far as you can on the track then hold it and roll the window up some and push down on the molding as you roll the window down. Few times like that and it should work.