No, I know fogs were GT or add on and not standard.
I have a '68 Ford service replacement non-GT grille and it has the black/blue two tone, which you indicate is GT only, yet it has no fog cutouts...
Am wondering if it was a one-size-fits-all replacement that is "incorrect" for a non GT car. (its a 70 or 71 mfg date IIRC) And if so, why Ford would go to the expense of painting two tone if it was only correct for GT's... which were a smaller percentage of cars than non-GT... would not seem logical to me to make a service replacement for the smaller production configuration.