I think they have them here -- I got mine from BuyMBParts last year.

http://www.***************/ShopByVehicle.epc?q=&yearid=1993%40%401993&makeid=63%40%40MERCEDES%40%40X&modelid=6239%3AMBC%7C1522%3AED%7C10000022%3ASM%7C20%40%40300TE+Base&keyword=wiper&subcatid=P:242111@@Wiper+Blade+Insert&mode=PA

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David
1986 300E Anthracite + ECodes + MB Mileage Award