Take a look also at motherboard south-bridge blocks. Usually these have pretty wide fittings range as well and should work just fine on GPU core as well - at least thats what I grabbed for my 6770 (the block was ~14 euros at discount at Aquatuning). Only issue with those is that hoses tend to exit the block perpendicular to the card so even when using 90 degree fittings it's not as space sparing as a true GPU core block, like EK ones, for example, that can be pulled off even with just 1 slot clearance. With 90 degree fitting, depending on the block you get, it can be as bad as 3 slots (a "single slot" in terms of PCI/PCI-e is approx 20 mm).
While GPU universal blocks can be found on sale often enough as well in my experience you can get, if you are lucky, some motherboard stuff far cheaper on sale. Presumably just bcos the manufacturer description claims something on the lines "awesome block for NF200 chipset" and the store just wants to get rid of it eventually.
The SB block for my 6770
Alphacool NexXxoS NBXS-A Silver Northbridge blockEdited by Carniflex - 5/18/12 at 1:50pm