I have an '08 (they went closed loop that year), and have been told that some of them are compatible with the cruise control. What I was told is to look above your oil filter. If you have a wiring harness there with nothing in it, that is where to cruise plugs into. I am not a wrench, so I don't know how true this is. I do, however, have a wiring harness there with nothing plugged in.
Hope this helps some. Best advice is to seek out a good mechanic that you trust, ad let him (or her) tell you.