As a Five-Star Safety Rated Vehicle New Mustang Convertible Stands Alone In Its Class - VIDEO ENHANCED (The Auto Channel) DEARBORN, MI - October 6, 2007 ? The Ford Mustang convertible, the best-selling convertible ever, is now the first specialty sports car in history to earn the highest possible safety ratings in all New Car Assessment Program (NCAP) test modes performed by the National Highway Traffic Safety Administration (NHTSA).The iconic 2008 Ford Mustang convertible stands alone as the only convertible of ...