I have a EB explorer that came with black roof rack side rails. I bought new rails from ford for a limited that are chrome, but don't know what all is involved to remove the existing ones. I wnat to reuse my original end brackets and center support. Are the end brackets and center bracket bolted to the roof? Are there nuts welded underneath or do you have to remove the headliner? Anyone who has removed the rack or the rails, let me know any tricks to doing it. I will just be replacing the rails. Thanks!