Hi josh they bolt straight up, I have put a 2013 on my 2003. you will need a extra long tongue for the tow bar if you run the step or change the towbar to the late 2009 type.
Yep he's onto it. I just came in to confirm also as I know I had a heap of trouble getting a straight answer when I did mine, every single seller told me they wouldn't fit, I just had to buy it and do it myself.