Dave I think you can interchange between 64-65 as long as you change all the hardware along with the glass. The regulators themselves interchange if I remember right. I went through all this on my 64 Tempest/GTO convert when I did the tinted glass and power windows.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
