The Mondeo has a short (stubby) bumper which doesn't stick out from the car. The Contour has a big gargantuan bumper that sticks out really far. If you find a photo of each, from the side, you'll see the difference. Or do what I did and import an ST200 bodykit, find out it doesn't fit and then try to get Ford to take the parts back.
Either that or just trust me - it doesn't fit.
