A shop, The Wheel Specialists (Wheel Specialists, Inc.), here in Tempe customized them to fit the Roadster. I’m sure they still have those specs if you’re interested.
I tried to organize a group buy way back in the day, but we didn’t get enough interest. The owner of that car is a friend of mine and ended up getting the wheels on his own. They look fantastic in person on his car.
Shoot me a message and I can give you some contact information for the wheel shop. They’re a class act, absolute pros, highly experienced, and do great work.