I have purchased them
I purchased a beautiful OEM set, factory installation instructions included on Ebay (Shops NOT auction items) for around 165US$ in February. I've seen them posted since, so you might keep your eye on this seller and/or description, or just contact the seller and see if they can still be had. Great quality parts, perfect fit on my 1992 400e. Slight initial rubbing on tires when on bumpy roads, probably caused by slightly wider than standard tires.
Exact Description Postede: "Mercedes W124 300E E320 400E AMG Euro Mud Flaps Kit"
Seller ID: fourbyfourclub
Best of Luck