I dislike hacking into wire harnesses if I can avoid it. I did not realize they were included when I got my APPRADIO3 from Crutchfield so have an extra set which are posted in the marketplace here.

Receiver Wire Harness For select 2001-up vehicles at Crutchfield.com

Metra 40-EU10 Antenna Adapter Works with select 2000-up vehicles — Motorola male to factory antenna female at Crutchfield.com

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BMWCCA # 480346

'72 e6Tii rip
'90 e30iC sold