I am in the middle of doing this mod. I am running into a couple issues. The 09 rear bumper has two hooks that need to hooked on slots cut in the tunnel. The cooler sits tight against the bottom of the tunnel so that's a problem.
I could take off the stock cooler and I did buy a flattened stock cooler from a guy and of course now that it's time to use it I see that it has a crack in it and I have no welder, dang again.
I'll go out and scratch my head a little more and I'm sure I will come up with something. I have a 09 snowflap, tail light and rear bumper but, I also see where some have trimmed the bumper off the 05-07 rear ends and use them with the 09 rear bumper. There are a lot of ways to do this mod. I also bought the $85 tunnel end cap suggested in here and I'm trying to figure out how that fits into the equation.