The Patch Panel Kit available from Kaiser Bill. The Kit consists of four pieces as shown here. The shorter 29-1/2 inch "lower" pieces repair the area immediately above the rear wheel cutout. The longer 48 inch "upper" pieces repair the higher fender area over the wheel well.
This photo shows the cross-section of the pieces.
All pieces are curved to properly match the curve of the rear quarter fender.
The two pieces fit together as clamped in this photo.
The two pieces fitted together as placed on the car.