JJohn-----I replaced one about six months ago. Seems like it has metal retainers on the lip that secure it to the door. Had to pull the old one out with the window down. It was easy to snap in as I recall but be sure to fit the upward curve to the door side insul. strip before snapping it all the way in as once its in its hard to get out without tearing it up. No need to remove window. Dealer had to order mine, they are right and left, inside and outside. Couldnt find my receipt right now and am leaving town for a few days early in the morning,seems like about $28. -----Bob