I got looking at the roof photos of the various 2+2s, and one thing that I've noticed is that the roofs of these cars tend to be rusty at the upper rear corners (at least on the ones that have been used regularly over the years), where most other standard G bodies, the roofs are usually in better shape in that area. I'm thinking that sealing the rear glass in the 2+2s was not a big priority, because of the low number being built, and this led to the rust problem in that area. My 2+2 is rusted across the rear of the roof, just above the rear glass, and it leaks in the area where the glass is supposed to be sealed to the roof.