My mate, who owns an FF, but still frequents the Maserati Forum, has a set of tyres for sale from his FF. (I like Pirellis, he doesn't lol.)
The details are as follows.
Full set of PZero PZ4 f tread (Ferrari).
Fronts are 245/35/20 and rears are 295/35/20.
He is looking for 200 for the fronts and 275 for the rears. That's per pair.
He is in Glasgow area, and provided the following re delivery. "I would prefer a collection or I can drop off within 50 miles of me. Otherwise, I could courier the for additional cost."

If anyone is interested I can pass your info on.