Check the new forum Fastlane Specials. Here are the plugs:

http://catalog.peachparts.com/item.wws?mfr=TYS%3AOES&qty=1&sku=0031590403&cookieID=21212820H21215NSLW&source=www.peachparts.com&clientid=catalog.mercedesshop

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1992 400E current
1988 300E sold
1973 280C totalled
1973 280SEL never got it running
1971 250C my first love but rusted out