At the door jamb, Mike fits the front edge of the quarterpanel. As you can see, the gap between the door edge and the jamb is a little wide, and not even the whole way down. However, the highlight from our camera's flash is hitting on the body line that runs down the side of the car, and is exactly level on both sides of the door gap. That character line is the important factor in hanging a new quarterpanel-if it doesn't line up between the door and the quarterpanel now, it won't when the car is done, the doors won't be aligned correctly, and the side of the car will never look right. To compensate for the gap between the door edge and the quarter, it can be fixed with a light application of filler, or welding a small piece of rod to the edge of the quarterpanel and grinding. But the welding and grinding will create excess heat which can warp the panel, so Mike prefers to use filler.