Yes I looked on Ebay, craigslist, the Panoz factory, various Mustang forums, etc. The only thing I saw on eBay was a painted gunmetal BBS RK but looks like a different version (has additional holes, I'm thinking it's a BBS RK II).
I've been posting in a number of other mustang forums so this post might look familiar.
I own a 1999 Panoz Roadster which is pretty much a Ford running a 4.6L SVT engine coupled up to a Thunderbird SC rear end.
I mucked up one of my BBS RK rims and I'm trying to track down a replacement rim...