The stuff I have used has a limited shelf life so you are better off getting it at an autobody supply place.It can harden in the tube if it is old and most parts stores don't sell enough to keep it fresh.It is usually called urethane window adhesive or urethane window sealant.
Just so you know it is not urethane like around windshields and backglass. It is liquid buytle and you can get it at the same body supply houses. The window has studs because it is to hard to cut out urethane because of the angle and you can damage the outer fender and the outer molding. Liquid Buytle has a 10 year shelf life and never hardens and that is why it is still sticky and is hard to remove. 12 years in the autoglass business.