Will fanblade wheels fit with Brembo Upgrade Kit

It fits, I've seen cars with the 14" Brembos and fanblade wheels.

If I remember correctly you will need a 1 inch spacer

No, they will not fit without spacers. The literature you've seen mention that it will fit with GT-500 or equivalent offset and backspacing rims.

I contacted Ford and they said that the 18" bullit does NOT work with the Brembos and needs the spacer, but the fanblades DO work, plus I've seen a few fanblade 18s that didn't *look* like they had any spacers and had those brakes, but I could be wrong...

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.