Why not just get the one you have rebuilt? I had the same problem with
a volvo engine and a new seal was about $25 when the price of a
rebuilt pump was close to $200. I never priced a new one. It was a
truck parts company that rebuilt my pump

My water pump drips proportionally with its speed. A replacement pump
is going to cost over $500

Has anyone found another pump that will do the same job on a ysb12?