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Dimensions look a little big. Also lights like that can get pretty hot and may melt the plastic grill material around the light. Of course if you have the fabrication skills you can probaly make it work
The stock 2011 GT fogs are 6.5", so presumably those should fit within the opening. But I would expect to do some work to get them there. I've been searching for a useful replacement as well, however I want to put them in the lower grille. No luck so far finding any that are small enough yet put out a useful amount of light. I would be very interested if you did try these though.