check ebay. search for mercedes EZL or mercedes ignition control module. plenty of them there for the m103 engine.

I got quoted for one for my car around $1500.00 used. But when searching I found several on ebay for your engine model, whether the part numbers are the same I have no idea..

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon