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early cars did not have the bar, GM did not realize how bad the problem was until the kicked some out for sale...cant recall exactly but I think it was the third week of Dec?? they started showing up...I think CRG has it pinned down for a exact date.
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CRG info says "mid-December 1966"
http://www.camaros.org/radiusrod.shtml
Sue's 12D car (12/24 Protecto-Plate delivery date) has the bracket..
