Thanks Mike,
I have those same pics. I have item 3 (the canbus controller/adapter) but steering wheel controls don't respond. I did finally get a reply from the seller wanting me to take some pictures from the rear of the unit in case the canbus adapter is the wrong one. (I'm still curious as to why there are 2 wires hanging out the back for steering wheel control - items 5 & 6 on the top pic). I'll take the pics today and send back to seller and see if I get an answer.

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2004 E53 diesel.
Titan silver on black
Sports package