how to put headlight assembly in to the header panel after you replaced header panel dont understand the black plastic pieces on the threaded studs
headlight assembly on 1997 Mercury Cougar
This is unfortunately something you will need to get first hand assistance with locally, probably with a body specialist. Or even just someone that has knowledge of these cars. Even though I know these cars very well, I couldn't begin to explain how to make things work for you based on your description and not seeing it in front of me. Sorry!