Genuine BMW part 65 52 8 384 684: Rotary knob on-board monitor, radio. The number stamped on the part is 65528384684; BMW's catalog files it under the short number 8384684. You will find it on our Instruments & Electronics shelf, under Other Audio, Navigation, Electronic Systems parts.
It fits the E46 sedan, coupe, convertible and touring (320i, 323i, 325i, 328i, 330i and M3, 1999–2006), with the M52, M54 or S54 engines — and the European-market versions.
BMW draws it on 2 diagrams, among them On board monitor / TV amplifier (65_0491) and On board monitor / TV amplifier (65_0595). It weighs about 5 g (under 0.1 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.