The new 599 GTO has rear tires that have the proper width and diameter for a FGT. It is 20" so custom wheels would be needed though.
http://www.roadandtrack.com/tests/impressions/2011-ferrari-599-gto
...But possibly the biggest difference are the 40-mm wider front tires, now up to 285/30ZR-20, versus the rears which have only increased in width by 10 mm, to 315/35ZR-20. The Michelin Pilot Super Sport tires, with a compound developed specifically for the 599 GTO, also do their part...
http://www.roadandtrack.com/tests/impressions/2011-ferrari-599-gto
...But possibly the biggest difference are the 40-mm wider front tires, now up to 285/30ZR-20, versus the rears which have only increased in width by 10 mm, to 315/35ZR-20. The Michelin Pilot Super Sport tires, with a compound developed specifically for the 599 GTO, also do their part...