Thanks for those directions. I used a Fram CA4303 from Walmart for about $5. It seems like one side of the filter box is about 1/4 of an inch bigger, so I constructed a nice shim out of the box to be sure the air is going to get filtered just a little bit more.

I noticed the cowling cover and the screw covers seem to be made from a very soft plastic, so if minor scratches are a concern to you, be sure to use a nylon prying tool or some other object.

One last thing, I noticed the filter Ford sells online doesn't seem like it would fit at all as it's twice as wide at one end compared to the other.