It just about has to be ATC related
If it were an obscure option or dealer add-on , all the big timer fullsize guys would have turned it into a buzz-word long ago.
However, it does surprise me that i have never seen it or noticed it on a 65-66 anywhere before either. And i sold lots of big car stuff in the 80's & early 90's in my junkyarding days. So i always examined every Pontiac i encountered.
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