changing headlamp bulb on passenger side

In addition to the two mounting screws on the headlight assembly on your 2004 Buick LeSabre there is a "ball stud" that must be released from its "socket". My service information states "Using a pry bar, gently pry in the center area of the headlamp assembly. Pry the headlamp assembly straight forward in order to unsnap the headlamp ball stud from the ball stud socket." The illustration shows a fairly long pry bar, inserted from the top, prying on the back of the headlight assembly right in the center. When reinstalling the head light assembly be sure to reengage the "ball stud". I hope this help!