[Kurt S]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mtb</div><div class="ubbcode-body">NO such color listed for Pontiac, Buick, or any other GM car...special order only, NC/SC only. Believe what you want, it was not a standard color and the data plate. </div></div>

I'm not following. Any dealer could special order any color. Denver dealers and others in SD and CA also ordered this shade of blue.
There was no production Chevrolet color this shade of blue so dealers often ordered paint colors from other GM lines (though they weren't limited to just those colors). Different Carolina dealers could and did order different shades of Carolina Blue - 63 Wedgewood blue &amp; 69 Azure Blue come to mind. Real GM colors that were actually used.
I bet the zone provided some guidance on color choice. Most I have seen are the shades shown in this thread.