Conti-Kit
I released the Conti-kit (The Aston Guys were specifying it at the time and it made sense for the GT). It seals damage from a 1/4" bolt (this does not mean a 1/4" hole) as long as it is in the tread and not the shoulder or sidewall. We tested a few size screws and bolts including a 1/4" lag bolt and drove it hard on the handling track after using the kit...way, way beyond recommended and they held up fine. Simply intended to get you home or a shop for replacement.
It is latex as noted here so it cleans up with water. I believe the "generic" Conti-Kit sold at tire rack at the edge of the GT rear tire size is the same as the Ford OEM, but not positive. I would not use any of the other slime options. However, I have plugged more than a few tires with good success, so that would be my other recommendation with the Conti-Kit compressor...turn off the sealant. Again, any repair of this nature should be considered for "limp home" on a FGT. Too easy to forget and drive it hard.
Scott