He has everything he needs to enjoy the radio and the steering wheel controls.

But be able to work the trip meter, mpg readout and such he will need the ibus adapter later on.

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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