You're right - there are differences with the 05s, I just don't know what they are. That's an odd choice, good luck with it!
Found this:
http://www.k20a.org/forum/showthread...ighlight=k20z3
That and the links provided in it will probably get you a bit further. Then I'd say do another search on K20a.org for the 05 specific issue if it's not accessable from that link.
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