Retrofit e60 DVD Pro Sat Nav

Hope someone can help.Got a 2005 e60 525d M Sport with quite a basic spec and am looking to add Pro Sat Nav to the car.At the minute I only have the standard fit single slot CD player.I have managed to get a Pro CCC head unit (cd & DVD drives) from fleabay which is guaranteed working.Naturally I need the wider screen,but was told that this would have to have been from the same car?? Can anyone confirm this?? Also been told I would need a new i-drive controller due to the added functionality that the sat nav needs??

I fully understand all the programming that will need done and thats fine but I'm sure that as long as the screen has the same plug input then that should be okay.Any advice too about the idrive controller??Any help would be much appreciated.

Cheers all.John.
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