The right mounting tab on the rear spoiler light assembly has broken away from the main body of the fixture. I want to replace it but the mounting screws are frozen tight. I've tried solvent and easy outs on one of the screws and have succeeded in getting the screw to turn but it will not back out. I think I need to access the screws from the inside the spoiler assembly but don't know how to remove it. Can anyone give me some direction? Thanks.