Here are what my extra / option codes are. I'm going to try to get more information on them.
M 002 US Equiment
M 290 Mud flaps, rear
M 698 Unknown, Seen on 1973 Beetle
M 699 Unknown, Cannot be identified
Here is a great link from TheSamba.com that has a lot of option codes.
http://www.thesamba.com/vw/archives/info/mcodest1.php


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