Roy: Your list begins with PN of 10th generation of BM54 (6 976 963/4) that as the first gen. of BM54 supports MP3 (with CD changer with MP3 support) and as You go down the list, the generation of BM54 radio decreases. So mine (6 922 510/1) is 3rd gen. [09/2002 to 12/2002] and e39-528touring´s (6 919 078/9) is 2nd [03/2002 to 09/2002].
m5james: I did it three times in total and with the last adapter I used subsequently several resistors in range 330-147k too and no AUX text on display at all. According Your last "google translate" link there should be AUX IN available for radios from EDIT: 09/2002, so my 3rd generation of the BM54 radio.

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Despite driving Xs´smaller brother E46/3, still having a lot in common ...