I'm not familiar with this yr/model, but the following might help get you started:

http://home.hiwaay.net/~gbf/107sl.html

I believe there's an "older car" section at this site - may not have worded it quite right, but you should be able to find it. That may also be a good place to post info. The "Search" fucntion here will bring up all kinds of valuable information as well.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"