Due to the extensive rust in the roof area, I've located a complete roof assembly (skin and all) that I could either install as a unit or use for parts, and a few parts cars that I can simply get the individual panels that I need to reconstruct the roof area. It's a bit beyond the hand fabricated patch method in a few areas. I'll need to get the actual factory panels. The area above the rear passenger windows is nearly gone.

On a side note, what are these numbers stamped in the flange where the 1/4 meets the roof?