I have an '02 M5. The existing radio module is BMW Navigation Business BM53 65.12-6 919 080. I'd like to buy the latest version which is P/N 65 12 6 988 276 which supports an aux input. If you've got one that you'd sell, please let me know a price.
I have a unlocked one as well as the AV in out cables. However its for a 4:3 model. If you search under my name you will see my for sale ad. I'm posting from my tablet otherwise id post it here. Let me know if it would work for your application