No. People aren't going to make closed-loop water coolers for graphics cards without selling them AS part of the graphics card (the ARES II, for example.)
The reason for this is that most people who are looking to water-clock a GPU wouldn't even TOUCH a closed-loop cooler, due to how many issues they have. If you go with a real water-cooling loop, you'll find plenty of waterblocks for the 590.
EDIT: Guess I was wrong. There was one out there - the Omni N590. However, it's no longer manufactured, and you'd likely have a heck of a time finding it. It would also be NO easier to install that then it would an actual waterloop.