Zender and AMG are the most likely culprits. BBS Lorinser made kits as well. I have a zender on my bench I am need to mount. It is for a 126 (part number is 126) but was on a 123. ebay.de is a good place to start.

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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42