I will take a poke at it, but you might see about a 57-59 Ford /Mercury or Edsel of any model, maybe even a Lincoln of the era. They used many common parts and the roof and window areas I believe were the same. I'm not sure I have an interchange that goes back that far,but will look tomorrow in the A.M. It wouldn't surprise me though. If they don't I will checkwith a local guy that has sevral '57 Mercs, not sure if he wants to part them though. One other place, if you haven't checked already is Hemmings. In the product section there are always obsolete glass suppliers.