The 86 notchback that you found is an SE model.
Even though the parts are very similar, they will not work with your GT ......MAYBE.
The differences lie in the belt line molding and the side marker light fitment.
The 86 SE has grooved side molding and marker lights, as well as the grooved molding on the top of the rear fascia.
The front fascia grooved molding piece in front of the side marker light is a separate piece, whereas on your GT it is molded as part of the fascia.
The metal plates attached to the front fenders and rear clip are also different between the two molding designs, however, they are riveted on and can be removed.
I don't know what mods you want to make, but this info should help you determine if the body parts from the 86 SE will work for your project.
Good luck!
Edit to add, the GT and SE use different rear decklids.
The GT has a different design (larger) vent that the SE.
[This message has been edited by olejoedad (edited 11-08-2025).]