it's either a 2.0 zetec, 2.0 duratec, 2.3 duratec, or SPI. as stated before, the underhood sticker will tell you. either size duratec will use the same alternator.
hatchback automatic? I need to buy an alternator for my stepdaughter's car. She lives 100 miles away, and cant figure out how to tell me what size the motor is. How can I figure it out. Is it in the manual?