In the series they ran 235 front and 295 rear iirc. Get whatever aspect ratio that gives a height closest to stock.
Hi C Ryan, Those wheel centers are the ones I ordered from Ricambi for mine. But I recommend you also order (or use from an old set) the rubber O-rings that go behind for a better fit that will supposedly also keep them cleaner. Daniel should also have those. http://www.ferrarichat.com/forum/348-355-sponsored-bradan/470302-question-wheel-center-caps.html Robb