This is were i got mine.
http://www.alleurasianautoparts.com/OEMParts/mercedes.wws
$290 free shiping

BTW
My pump worked fine (199k miles) but the sheet metal cover was leaking oil onto the belt and it made a real mess under the hood.

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82 Rabbit diesel (first d), 84 Jetta turbo d (300k when sold), 83 240d (305k when sold), 84 F250 6.9d w/Banks turbo(parts truck), 86 F250 6 cyl.gasser(waiting for 6.9d), 84 300d ( 347k Sold 8/04), Y2k New Bettle TDI (185k miles), 95 740IL (wifes), 87 300TD (206k Sold 7/05), 05 Passat TDI Wagon