If you are looking for new glass I highly recommend OEM Glass in Bloomington, Illinois.
The specialize in collector car glass and can even provide glass with original script.
Jim
Pilkington Industries' LOF (Libby-Owens_Ford) division was the original supplier of most GM glass. You can order it today. Go to http://www.glasssearch.com/ for their phone numbers.
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1966 Skylark 340-4
Parents bought new