I know that this is kinda late but I'll add my 2 cents worth anyway. The metal insert on your car is correct. This was the only year they used this setup. The metal roof also doubled as the antenna for radio equiped cars as it is insulated from the body. If your top leaks or nedds removed for any reason you'll find that there is a flat rubber seal that actually seals the roof. around the outside it was finished with a rubber strip called Wedge-Tite to fill the gap between body and top. Neither of these seal are available anymore,however,ther is a man reproducing a rubber seal that looks as if it will work nicely. Not completly original but you have to make do sometimes. Good luck on your project!