Date registered: Jun 2009
Vehicle: 1991 300E
Location: Maryland's Eastern Shore
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I got my copy of the service manual CDs on eBay for a very reasonable cost. They are complete, but the original interface requires an obsolete version of Internet Explorer. Steve Nervig did the interface/index used on the on-line version linked above and it loads onto local drives as well. He might now where to find what you need and can be reached at "sportline.300CE at mac dot com"
I've Googled around looking for stuff on the M111, but without significant success. If I find something, I'll keep you in mind. Good luck.