Nolan, I'm late to the party but I hope this helps.
If you have the original water pump, it can be rebuilt. That doesn't help you at the moment but don't through the original out. "They are hard to come by even as cores" I've had four of mine rebuilt for around $100 or less. Any of the major auto parts stores " Shucks or Orileys" send them out usually with a week or so turn around. Just make sure they use your core......
I believe what you have pictured will work if you have hoses and the pipe...
Good luck
Mark
PS those rigs look fantastic....