1966 Dart 2 door driver window glass

Hello, new to the forum and a new car for me. The driver window is broken. Unfortunately the only suppliers I have been able to get a glass from has a square shape at the upper front corner. My car has a curved upper front corner.
The part number all of the suppliers come up with is a DT 4401. I am at a loss and so are they. Does anybody on this forum have an idea?

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