Don't know if it helps any, but im just away to fit a set of Punto
(not Grande Punto) Sporting 15" alloys to my wifes 500 tonight.
Checked,
4 x 98PCD,
central bore is the same too, 58.1mm,
offset is different by 2mm (33mm to 35mm) nothing drastic.
Its really a winter set of wheels and tyres but want to see how they look now (the big kid in me!).
Happily put up a pic' if you like?