You need number (11) on the image below. I could not find the piece that is specific to that area. You will probably have to cut the piece below to fit. Or you might be able to just glue on the one you have. The problem is it has a hole or it fell off or is loose. The piece I am talking about is under the black plastic piece that covers the bottom of the windshield and the wiper arms on the passenger side of the car. Here is the link to the site, although you may be able get it cheaper elsewhere:

http://www.gmpartsgiant.com/online/P...igPicture=True