Actually, in 71 and 72 they were assembly line installed, but they were just like the dealer installed units under dash...actually, i think that was for 72 only.
The switch, being described, (which I personally have in one of my trucke w/cruise) is not the correct switch. It is a later switch. You can find this common switch in many GM vehicles up into the early 80's. I should have kept the pic of the correct ont...but this isn't it.
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