Are you after the display that sits on the dash or the CID controller that goes in the dash?
The display isn't the same as the X3 as the contour of the casing is slightly different, so it'll poke out of the top of the dash more than a standard z4 one.
mine at the moment is grey but don't have enough cash or guts at the moment to make a hole in the dash unless one of the experts wants to help out that's why haven't bought any of the other parts yet