I go to car shows and other outdoor events. Finding a folding chair that will fit under the bonnet of a GT and still be a REAL chair when set up was a bit of a challenge. Have never seen one of these before and a search here did not turn it up so figured others might be interested. Its a Pico Folding Arm Chair. A bit pricey for a chair but it does fit, looks good with the car, is comfortable and seems well made. Pay no attention to the color name. The one labeled 'Sage' is gray and black and is a good match to the GT interior. I paid $93 with 2nd day air shipping.
http://www.amazon.com/GCI-Outdoor-PICO-Arm-Chair/dp/B0042X0YCK
http://www.amazon.com/GCI-Outdoor-PICO-Arm-Chair/dp/B0042X0YCK