I just purchased a 2004 Ford Ranger XLT 4.0 supercab 4X4, rear window leaks on the upper driver side, even a sprinkle of rain, it leaks. Already checked the 3rd brake light, upon removal no moisture or wetness inside the cavity on cab, light casing also dry. Already removed the molding in the rear cab driver side, it appears that the stud for the window is were the leak is,upper driver corner, there is 8 studs in all, 3 across top and bottom and 1 on each end. any suggestions???