I contacted Marvic and Roin last year regarding 10“ wheels. Their response was prompt and courteous. Be aware that prices may be quoted with and without local sales tax. Quotes include local sales tax when the final destination of the goods is a european country.
Quotes exclude sales tax when goods are shipped to the U.S. The recipient will have to pay customs and probably local sales tax.
Be aware that Mr.Fiat´s advertised prices include customs charges. Check total price before ordering goods directly in Europe. You may be better off buying from the authorized distributor, especially if you have a warranty claim. It is common practice that the manufacturer will not sell goods retail if he has made a deal with a distributor in the area. Maybe no response from Roin directly as Mr. Fiat is the sole distributor for Roin in the U.S.?