hmm..

I think I am confused. Why wouldn't a RF unit from an xterra 03 fit into the stock head unit of a 05 xterra? All the connectors seem to be the same the regular stock head unit of the 05 looks exactly the same as the one from the 03.

I was under the impression that the 03 xterra rf head unit can be plugged into the regular 03 heard unit.