http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=170295999202&viewitem=
Via http://bringatrailer.com/2009/01/22/trans-am-history-1968-ford-mustang-race-car/
Keep your eye on Bring a Trailer, it's the best filter of terrific ebay finds I've ever come across or heard of.
http://bringatrailer.com/2009/01/15/basketcase-1967-shelby-mustang-trans-am-coupe/ for a 1967 Mustang , supposedly #24 of the 26 Shelby Mustang Trans-Am coupes. The seller claims it took 2nd place at Riverside and Dayton in 1968