The most important bit is the PCD, which on your car as most fords is 4 X 108, get them in a size that suits ie 15", 17", alloy wheel suppliers will list these by fitment of car/model.
The other thing you need to watch is the ET, this is basically how inset or outset the wheel is, it comes from the german EINSPRITZ TIEF, which means INSERTION DEPTH.
tabetha