Will not fit!
I can tell you first hand that the Fanblade wheels will not fit without a spacer. I just installed the FRPP M-2300-s Brembo kit and they failed to clear the Fanblade wheels by about a 1/4". A 1/2" spacer will work, however I chose to go with Steeda pentars rather than mess with spacers. Spacers will put extra load on your wheel bearings, and if the spacer doesn't have a properly engineered shoulder to support the wheel load, they can be dangerous. There is a Ford Racing website that shows the Fanblades as fitting the big brake kit, and I have seen pictures of them on the web, so I was rather hopeful they would fit. They didn't fit on my 06 GT, and as far as I can tell they haven't produced two versions of the Fanblade wheel, or the Brembo kit.
EDIT: I just read a post from a Ford engineer who states the "race brakes" FR500S/C brakes with two piece rotors will fit the Fanblade wheels, however the GT500 brakes will not. That would explain the pictures on the web, as well as the conflicting reports.