Duncan is selling them here in Sydney (he will ship, of course), and he owns an R32 GT-R race car as well as an s1 Stagea. The link can be found HERE. It might be a fair bit more than the eBay item, but you've also got the knowledge that it should work.
PM him to see if it works on the Stagea, as I'm not sure he's tried it yet on his car...