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AFAIK, that adapter will work in any application that has a 6" x 9" speaker hole. The only one that might be a problem is if the 6" x 9" hole you want to use it on goes lengthwise to the car instead of side-to side. You may run into a clearance problem fitting in the speaker & the defog motor.
I believe there was only one adapter made, and it worked in all bodies.
Makes sense. This particular unit is from a 72 Polara, 2-speed switch (with resistor). 6x9 holes run side-side (thought they all did), with the blower oriented further into the trunk.
With 3 mounting points, the 3rd is offset 1.5".
WANTED: Your 71-78 Late B-body sedan parts! Police or Civilian.
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