I would say, yes. But don't quote me on that. A couple of people on the forum have stilo wheels on and so should be able to tell you, failing that just ring ur local fiat dealer and ask them, especially if you bought the wheels from them.
I have fitted 17" stilo abarth alloys (3 prong design) to my marea. When I had my car fully loaded when goin back to uni thay did scrub at the back a little and the lip on the rear arch has been slightly bent and some paint has flaked off. Don`t ask FIAT like the bloke above has said cause they will always say NO they are npt for the bravo, sort of making sure you can`t blame them if anything goes wrong. Fiat can`t even tell you the offset ofyour wheels or anything like that.
iv got fiat coupe turbo 16's on my bravo and they rub the arches with a load in the back, without a load theyre fine. theyre 205's tho anything thinner and i reckon theyl be ok...