That's correct, I bought it from a local dealer for around $130'ish. Regarding the tank size, you just need to have the dealer hook up the DRB to the truck and tell the new unit that you have a 34 gal tank instead of a 26 gal. The part # was 56049707AF.
To remove the existing unit you need to remove the light covers on each side. BE CAREFUL! They are fragile. I used a small screwdriver and gently applied resistance to pop off the lens covers. Once you remove that, you will see two torx screws (silver) holding the console in place. Unscrew those and pull the console down gently, the front clips will come off easily. Once you can see in there, there are two jacks, one to the module and one for the lights. The light jack is easy, the module jack is a bit snug. But, there is a clip below the jack that you need to push in and pull out. Once that is done, plug in the new one. Enjoy...