you have to unbolt the window. it sealed with a tape called butyel tape. unbolt it and scrape out the old butyel than either use new butyel or urathane adhesive from a glass shop to re-install it. please dont use silicone it causes the metal to rust. most autoglass shops would do it for you for 75.00 to 100.00 but if you take it appart i bet they would do it alot cheeper.