The rear taillight panel, I thought would have been an easy job. However....
I had to cut again the taillight out of the body. After doing this it was just a matter of putting the taillight panel in place, NOT......
The taillight panel from MustangsUnlimited did not fit at all, as you can see on the picture, sanding the panel was not easy and it did not tolerate for errors.
So then mailing to Mustangs To Fear for another taillight panel, no problem with fitting this one.