There should be a conical shaped spring behind the window cranks. Sorry I can't help with the numbers much.
Welcome to the site. I saw your other thread in the lobby. Good luck!
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-Jeremy
1968 GTO 4-spd convertible, console, factory gauges, hidden headlights, 3.90:1 posi, AM/FM radio.
1962 Catalina convertible, Starlight black w maroon interior & white top.
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