I believe that the speed rating (Y instead of W) is fine, because W is a minimum, but the load rating (94 instead of 98) is below that specified for that wheel/tyre combination.
The load rating, from what I read on here is more important than the speed rating: this is because it is the load you create when cornering as opposed to when the car is stationary. 1980kg at 50mph round a tight bend creates a lot of tyre-ripping-off-the-rim forces and personally, imho for a few dollars more is it worth it??
At the very least I'd check before you buy.
146 1.6TS, 156 2.0TS, 156 1.8TS, 147 1.6TS, 147 2.0TS, 159 1.9JTS, 147 1.6TS, 159 1.9JTDm, Mito 1.4, GT, Giulietta 2.0JTDm, Giulietta 1.4tb, Giulietta 1.6JTDm........