There aren't many of these around. I have only seen four ever for sale. There are two versions, this one which is polished and another that is unpolished. I believe they were given out at the introduction of the car in 2004.
http://cgi.ebay.com/FORD-GT-INTRODU...goryZ418QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://cgi.ebay.com/FORD-GT-INTRODU...goryZ418QQssPageNameZWDVWQQrdZ1QQcmdZViewItem