Try these guys....

http://www.mercedesdismantlers.com/index.html

or you can get a set of chrome caps from....

http://www.************************/product_page.asp?attFlag=0&appFlag=0&productname=Chrome+Lug+Bolt+Covers&productfamily=Lug+Nuts&subca t=Wheels+%26+Wheel+Accessories&category=Accessories+Exterior&make=MERCEDES%2DBENZ&model=420SEL&submo del=+&series=126&year=1990&vehicletype=CAR&keyword=&vendorid=&search=

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1990 420 SEL / 151K mi.