What holds the plastic windshield clips on the car that go across the top? I need to replace some but until I remove the trim I can't see what holds them in. But, I don't want to remove the trim until I know I can replace them without having to replace the glass, too! The one that is broken looks embedded in that goop holding the window in so I can't tell what's going on. The look different than the metal ones on the side.