Try Wheel Couture (e-mail: firstname.lastname@example.org). They might have a set of OZ Futura center caps for sale. I know they've sold a few sets of reconditioned Futuras recently. There were at least two different styles of Futura center cap, so make sure you get photos, so you know what you're getting. The later style had a carbon fiber ring and recessed logo, which you may not like as much as the early style that was used on Si 9602.