I think this is the one you are talking about Nav radio
I had my 04 apart a couple times and everything was right there.I hear the 06 is about the same. The one in the link is a little spendy, do a search for mr-cd on ebay ,he gets a lot of take outs and sells em cheaper. The gps antenna slips into a bracket right under the center dash.Everthing else is plug and play.If you like sirius I would consider installing at the same time,easier now. Good luck,they make it easier getting behind the dash these days. BTW they are nice units,better then most after market.