Those BBS REs are close, but you might be better with two other options to fill the Fiorano's wheel arches. The Museum Collection's metal Challenge rims for the 360 are pricey but they have the look and are the right diameter. (http://www.hlj.com/product/MCLTK-01), OR you can take the rims right out of the Fujimi F430 Challenge kit (http://www.hlj.com/product/FUJ12268) and still have an F430 to build! Hope that helps some!
Before anyone makes any expensive mistakes, please read the following.
I have all the aforementioned wheels. The Museum Collection wheels are 18's, they're the exact same diameter and width as stock 5 spoke Tamiya 360 Modena wheels. They're so small on the Fiorano they get lost under there.
The Fujimi BBS RE's are the closest in design, but they're 19's, the F430 Challenge wheels are centerlocks and have a slightly different shape of spoke and are the identical diameter as the BBS RE's. Unfortunately both of these Fujimi wheels also get lost under the large wheel openings of the Fiorano. So far nobody makes correct BBS wheels for a Fiorano. I'm picky enough that I'd not be satisfied w/undersized Challenge wheels on the model. If anything kit wheels need to be +1 to look correct visually in scale.
I'm planning to take a set of Pegasus Vanquish 2-piece wheels, remove the centers (they're separate), and cut/fit Fujimi RE's in their place. This makes for a very good look, though not as nice as stock Challenge wheels because the rim portion is a bit thicker. But it's a better choice than all the undersized options so far. Unless someone takes some RE's and does the Coleman stove white gas trick to expand an RTV mold to the right size to make one master of larger than stock diameter.
If you have some .020" plastic sheet, you can wrap the RE wheel in one thickness to get it to just about the perfect diameter, and stretch the tire over it. I've seen modelers use this trick to make some traditionally undersized Fujimi wheels look much better visually.