Marty, the 1/4 windows are not the same from hardtop to convert. Just in case anyone is interested in this, which do you have? And Grand Prix/Grande Parisienne 1/4 glass is not the same as Parisienne/Catalina.
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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