I`d go with having the dealer replace the door. You are not going to have much luck in getting them to replace the whole car. I`m pretty sure you would have to "lawyer up", & then there`s no gaurantee you will get another car.
You're probably right. I finally was able to talk to my Dad tonight, who is a pretty good lawyer, and he is pretty confident in his ability to have them swap the car out. But, I would rather not bother him. So, if they can put a new door on from another black Mustang, and I can't tell the difference in paint color, and the reflection looks perfect from quarter panel to door to fender, I will accept this.. I would say that is a viable solution. I have the factory paint and seal on the door and I would be happy again.