I've always like that style of wheel.
I went back to check some of my old TRE / Penta motorsport links, and it looks like they have a new website. I cannot find the wheels similar to the original post anymore.
Guess they have the market to themselves.
The old PDF is still floating about the Internet:
http://www.pentamotorsports.com/pdfs/rim-flyer.pdf
Link to one of my old posts with photos of the other product:
http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/813579-wheel-color-4.html#post8094614