I´m dreaming of buying an DVD navi on Ebay and my question is: Is it possible to buy an panel too the climate control so it will fit in the dual din frame? Or is it more than the plasic front that seperats the units? And is it the same for the navi? Is it possible to buy one for an A4 and then change the front piece? As you can se on ebay the sellers says that their navi units will fit the A4 and A3 but if you look on pictures they have a separate fronts and the on for the A4 seams much easier too find! /Thanks!