I found this on the net. It's for the 2013 year, but I'm sure most still apply to 2014. It has a lot of package content codes. If you ever do searches for Jeep parts, you'll need to know the meaning of these codes.
"72" means 2-door.
"74" means 4-door.
"MEF" means "rock rails" (i.e., Rubicon rails)
This is invaluable to me. I thought others might find it likewise invaluable.