I have access to them. Rick Payton is the one who is selling them in the US.
This is a good thing for cars that sit, unmoved for long periods of time. Bias ply tires and the really low profile tires on the ultra high end super cars, as the later was what they were developed for.
If you are interested, shoot me a email.
David
Rick's car on them at the 2015 Grand National. I can't find a photo of my car on them as it was as well.