Actually the hitch is different on the 2006. Well the hitch it's self is not different,but how the bumper connects to the frame is. The bumper and the rear of the frame are different from the 04-05 MY and the hitch is built into the bumper. So it is possible the dealership does not have the proper parts. Although if I was in charge of the dealership I would just take a bumper from another truck to make the customer happy and wait for a new one for the other truck.