I have an '87 Iroc that I am restoring, and I cant figure out how to remove the large stud on the passenger side that the rear seat back "clicks" into. Second, I need to remove the rear GFX, and I don't want to break them, they look like when the car was repainted they weren't removed. And I can't firgure out how to get them all off, is the bumber extension removed first or the pieces driectly after the rear tires? and where are all the mounting locations and screws?

Any help would be great, thank-you