[bobss396]

I've seen it done in a restoration shop on an Impala. The window has to come out, so does the inside trim and headliner has to be dropped down and tucked out of the way.

The shop formed replacement pieces on the premises, tack welded them back in and made sure the window fit back into it. Once it was welded in place and dressed up, it looked great.

I don't know if replacement sections are available, your best bet would to find a donor car and a good shop that can make the pieces if you can't find them. Check Hemmings for possible replacement pieces.

Bob