Metal Fatigue points in A bodies

The area around where the door latch bolts to the door on the early A bodies always seems to be stress cracked around the screw holes. I fixed mine, then went on the lookout for an undamaged door for my 66 Cuda, and every door i found was cracked in this area, especially the drivers door. All that slamming over the years and thin metal takes it's toll on this area something awful.