the tyres are 215 45 17s ride is a little bit stiffer, but thats got to be expected from have 215 tyres with low profiles, think the off set is et45 the tyres are about 3mm away from struts will use it for a week or two there see if the tyre has been rubbing on the stuts think it will be ok thou,
also will the standard fiat wheel nuts be ok with alloys or are they like fords and have to change them