While I'm not 100% positive it won't work, I can definitely say that it does not look like the MK4 in my car. I would suspect it is not IBus, but is rather based on the new electrical / communication architecture (such as in the E60).
Here is what the ones for our car look like:
http://cgi.ebay.com/ebaymotors/LNEW-...QQcmdZViewItem
You can certainly find cheaper ones - I only paid about $550 for mine.
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