"Thought I'd pass this info along FWIW. Spoke to a retired GM employee at a recent show here in Dayton. Worked for Inland division and I had my pink 'bird there. Said he remembered building a special order Endura bumper for a GTO in the "pink mist "color. He also remembered that the customer was one of the Sinatra family. If accurate, that would mean there is/was at least one '68 GTO built in that color despite the fact that the color was only a Firebird color for '68. Guess if your name is Sinatra they'll paint it any color you want..

I know Nancy Sinatra had a pink 68 Firebird, haven't heard anything about a GTO though.