I don't have anything specific for the qustion you have presented, but I have found Steve Brotherton's comments in this thread to be interesting. There is a relationship:

http://www.peachparts.com/shopforum/showthread.php?t=150797&highlight=airfilter

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