The first link (WT5058Z) is the ECT, the second link is the CTS.
found this interesting. did a google search to try and find a pic of that something or other that Tom was oogling over in the building and came across this article:
2010 Carlisle All Ford Nationals | Horsepower Magazine
are you talking about this one?
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if so, then they are 18x9 and 18x10 hypercoated FR500 wheels. check out the link in my sig to see more pics.

maybe next year we can get a pic of the mystery machine in the line up....or at least hopefully velma perhaps?