Any one thinking of trying these with their GFX, not sure they would be any better than the custom coolers but if you had say a h90 or the kraken x40 knocking about it might be easier to cool a reference card rather than going fully WC.
http://www.overclockers.co.uk/showproduct.php?prodid=HS-007-NX&groupid=701&catid=2330&subcat=2262
http://www.overclockers.co.uk/showproduct.php?prodid=HS-007-NX&groupid=701&catid=2330&subcat=2262