For anyone curious this is what the interface looks like plugged into the usb port on the radio before being tucked into the dash.

I purchased the interface here :

IBUS Interface for BMW cars

Its the V6 one.

Attached Images

 

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
More are at my website

Aftermarket E53 Radio Install