Welcome to the forum Walt.

This topic has been discussed quite a bit. By using the Search Button in the upper-right hand corner and the words: 300E Water Pump

I got these results:

http://www.peachparts.com/shopforum/search.php?action=showresults&searchid=770014&sortby=lastpost&sortorder=descending

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)