I came up with 2 different options from other Ford vehicles, both of which work and fit quite well. I only used one of them, and still have the other sitting around. The one I went with is from an early 00's Lincoln Continental. With the round filter element, it had the most filter surface area, hence why I chose this one. I don't have any pics of the installed air box only....the only pic I have is complete engine compartment. It fits well on the drivers side, but could work on passenger side as well if you move the battery. I plan to enclose/shroud the inlet end later on down the road so it only pulls air from outside the engine compartment.
The other rectangular box pictured is from a mid 90's Lincoln Mark VII or Mark VIII(can't remember which). It actually fits even better than the round canister I went with, but I wanted filter surface area. Both of these are off 4.6 "Hot Rod Lincolns"....but neither of them 'drove me to drinkin...'
Edit: Both of these factory air boxes are mass air ready and have a flange internally to mount the mass air flow sensor to. You can see the wire harness exiting both boxes.