I've heard of people using an oil cooler from an escape and rigging it up. I believe the metal elbows on the cooler rust thru causing leak. there is a tutorial on fj.com to make the escape cooler work, might need to add some fittings.
Or contact Steve at tousley ford and he will be able to get you what you need. I also heard the cooler is discontinued.
I now drive a Japanese Ford.