I posted this in the body section, but may pertain more to fabrication.

Getting ready to dump my C&C hacked roof and put the hardtop back on the car. I'm planning on cutting the donor top I have where the factory copper seam is on the b-pillar and on my GTA as well, but for the front, does anyone know if there is a factory seam that I can cut on? Or would I be better off just straightening up the cuts on the donor top, measure down from a straight line and cut there?