Some parts like wiring harness you must buy by your lokal BMW-Dealer. MK4, GPS-Antenna, 16:9 you can find by ebay.
You need - as far as I know:
- Mounting frame for 16:9 display
- 16:9 display
- MK4
- GPS antenna
- wiring harness
- maybe other switches for seat heating etc.
- a lot of time and patience
And the whole remainder, which I forgot.
Costs: Approximately 1.500,- ... 2.000,- €
Greetz
Franz