filter this!
Okay, so judging by all the autos it fits, it's just a ford full-size filter, right?
If you really want to cheap out, its the same $3 ford filter I've bought for all my Toyotas for the last 20 years etc etc.
......that said, I like K&N, and use their air filters on everything I own, definitely worth $10 to protect our Lyco's oil as well.
( funny how it has the little wrench boss on the top, exactly like an aircraft filter eh?)