Hi Marlin. Some time in the car's history, there was a botched repair on the passenger quarter. When the "bodyshop" did it, they actually sliced vertically (!) at the center of the wheel well up to the window and then they cut ahead to the door jamb. Then they just trowled on the Bondo. When Al fixed it, he split the original wheel well (tub) at the factory seam. Then, he removed the full original (botched) quarter, and put the replacement in and joined it at the wheel well (tub) seam, as GM did originally. Doing it the way GM did it is a longer and more costly way around the fix (drilling out all of the spot welds, fitting, re-spot welding, etc.), but I believe it is (was) the right way to repair it.

So in answer to the question, nothing aside from the outer quarter and the outer half of the wheel well (tub) was replaced.

Hope that explains it properly.

Wayne