The factory switch was located in front of the sliding panel on the roof. GM used a molded interior panel which housed the roof, when retracted, and the motor and operating hardware. I don't know how they would do this in an aftermarket intall. Did you know the GM sunroof was also available in a manual model? I saw one in a 74 4spd Grand Am I almost bought, it had a built-in crank where the switch would be. Also, 77s were the only year a moonroof (glass panel instead of steel) was offered. Daver
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2 wrongs don't make a right, 3 lefts do. 4 lefts make a NASCAR race but who cares?
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2004 Grand Prix GT daily driver
1974 LeMans GT 455
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