Прошу прощения, вот я дурень.
Действительно читают MP3, вот куда можно прицепить:
E39, E46, E53 (X5) With Navigation
65 12 6 976 961 - BM53 navigation radio 8/05 - newer
65 12 6 976 962 - BM53 navigation radio 8/05 - newer RMFD
65 12 6 972 665 - BM53 navigation radio 3/05 - 07/05 production
65 12 6 964 398 - BM53 navigation radio 1/05 - 03/05 production RMFD
65 12 6 964 399 - BM53 navigation radio 1/05 - 03/05 production
E46, X5 Without Navigation
65 12 6 961 215 - Business CD 10/05 newer E46
65 12 6 943 430 - Business CD 10/04 - 10/05 E46
part number unknown 08/05 and newer X5 Business CD