I don't believe they are actually lug nut wholes but just styling. the CE28s have them as well. I'm not sure about whether they are still being produced. Your best bet might be to head on into the sponsors section and look for Forged Performance. They are the largest Volk distributor in the US and if anyone can get you a set, it's likely to be them.
http://www.the370z.com/forged-performance/
Here is their section. You can just PM any questions you have to them. I'm sure they'll be able to help you with getting hte proper offsets, colors, and availability of everything.
FWIW, they still list them on their website.
http://www.rayswheels.co.jp/indexe.html
Products>RAYS Wheels>Nismo (on left hand side menu)> LMGT4