Personally I'm in the same boat with a Monarch and a failed water-cooling loop. But seeing as the Monarch cost me $50, but a replacement water loop would be $150, I'm gonna just write off the Monarch.

Keep in mind, this is a closed loop, dual-pump package, so none of those on the first page of your search are even close to what you would need. I'll post what I found last month when I can get by the computer it's on. The units on the Monarchs are actually a common manufacturer that just OEM'd them for them.