FordPartsGiant.com offers the wholesale prices for genuine 2003 Ford Mustang parts. Parts like Cowl/Panel and Related Parts are shipped directly from authorized Ford dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.8L OHV EFI, 8 Cyl 4.6L DOHC EFI, 8 Cyl 4.6L DOHC EFI S/C, 8 Cyl 4.6L SOHC EFI. Transmission: 4-Speed Automatic Transmission 4R70W (AODE), 4AT 4R75W, 5-Speed Manual Transmission (T450D), 5-Speed Manual Transmission T5OD, 5-Speed Manual Transmission TR3650, 6-Speed Manual Transmission Tremec T56.