I have a 2006 2500 and I pulled the radio bezel off and saw that there were four plugs there that just snap into holes in the plastic. I am wandering if these plugs are for dual climate control, electric back glass, heated seats, etc. There is also a plug behind the adjustible pedal delete plate. I know my truck just has stationary pedals, but are the harnesses in these trucks all the same? If so, I am thinking of adding the dual climate control.