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https://www.steelsoldiers.com/threads/which-water-pump-part-number-do-i-need.176558/
That does mean a different fan?
and just for even more questions/answers go to
https://forums.g503.com/viewforum.php?f=63&sid=fadea6e678ae194ff34e68441e0b80c3
Different fans opposite driving rotation That "fit" different engines -problem found. If that turns out to be true than that information should be put into a sticky or a place where that information can be found.