I think that you'll find the video interface module is different as well, so it will require more than just the display to be changed. It may also end up with the upgraded nav system, so you're talking about more money. Near the beginning, a few cars into the USA came with the stock nav, when they should have had the professional one. Those were able to be converted to the larger display and nav system, but the owners did not see the cost involved. IT might be substantial. A digital display verses an analog one needs a correspondingly suitable digital input to work, whereas an analog one might just make the whole picture bigger to match the display.