To get it in there you push the cardboard box at an angle thru the opening from the front. You have to remove the door first. The door hinge studs hold the bottom of the cardboard, two screws hold the top edge to the dash, and there are two more that hold the sides. You may have to loosen the two latch screws as well. Before you tighten the door hinge nuts, align the door in the opening. The curved catch on the right side needs to be centered in it's opening or it will rub. Tighten the nuts. Then you can move the latch around a bit to the get the top of the door in/out to align to the dash. Of course, you must remember it's an old Nova. Don't expect stuff to align perfectly!