My friend has been borrowing my pair for about a year but ordered a GTX970 earlier in the week. I honestly don't know what to do with them, thought I would pass them on before they become truly obsolete. Too big to fit in my other systems, and would be overkill anyway.
You have your choice of the original air cooler, or an Arctic Accelero Hybrid kit. They used to match, but one of the pumps failed. Couple of pictures if you follow the links in my signature.
Be forewarned, these are triple slot cards, not the standard dual. They have a very heavy cooler (but it is really effective)