Ford has confirmed that the all-new 2005 Ford Mustang will be built at AutoAlliance International (AAI) in Flat Rock, Michigan. The AAI plant is a 50-50 joint venture between Ford and Mazda. The Mustang's new assembly line will allow the AutoAlliance plant to build nearly 300,000 vehicles annually by 2005 or 2006, plant officials said, and adds capacity for additional models.