And of course there is a guide on the Techenical Page on how to rebuild the water pump.

Where Are You From? Grand Junction CO

Do You own a car built by Durant? 24 Star, two 26 Stars, 27 Star and two 29 Durants

That's what I mentioned before Tom.

Now we know its a W5A there should be lots of pumps not being used someone could get one to him.

Where Are You From? Ottawa Ontario Canada

Do You own a car built by Durant? 1932 614 sedan made by Dominion Motors

There's one on Ebay right now. # 174837616686

Where Are You From? Texarkana, TX

Do You own a car built by Durant? Several

That's interesting Don and expensive. Note he says it fits 55, 65, 75 and M2 1928
Nice try but first 3 are 6 cyl and 4th is 4 cyl Here's part of aftermarket which says differently. 6 cyl has its own body and parts as does 4 cyl. Case of buyer beware perhaps.
Part number W5K400 might be a clue it fits a W5A 4 cyl or a fluke in number.

Where Are You From? Ottawa Ontario Canada

Do You own a car built by Durant? 1932 614 sedan made by Dominion Motors

A lot of things are getting expensive these days. The water pump listed on Ebay is correct for All W5 engines and will work on all W4's also.

Where Are You From? Texas

Do You own a car built by Durant? Several