Watercooled, huh? I may be of assistance!
I have a scrapped waterblock like this that I made, but when I was using a slitting saw to make the "fins" I ran it too hot and it folded a few fins over. Ought to work fine still, just not 100% and it's nothing but scrap to me. If you get me a hole pattern, I can waterjet a new mounting bracket.

Ought to be super easy to mod this thing to fit. You'll need to do some lapping though, I refuse to do any more than I absolutely have to lol