Hello, have read here in the forum that the RT3 have retrofitted. I would also like to do, provided I get cheaply to the components. I just want to retrofit the RT3 + color display. I don’t want the changer and the video input in the glove compartment. In my opinion I need the following parts: – RT3 N3 CAN bus – color display – light conductor cable RT3 to color display – microphone incl. cable to RT3 – 3-fold antenna (radio/GSM/GPS) incl. cable to RT3 Now a few questions en: Do I need even more parts? How else is the color display connected? Is this the same cable as the monocrom display? Can you retrofit the missing buttons on the steering wheel? I would be grateful for answers. P.S. Maybe someone has a type of how to get to the parts cheaply. At the dealer they are defensively too expensive.