Your absolute best bet is going to be the following...
Either:
This AIO from EKWB -
EK Predator AIO or
EK predator AIO with quick disconnects
Or this AIO from Swiftech -
Swiftech H220 X2
Then you buy either a full block for your specific GPU which would be ridiculously expensive for a GPU that outdated, or get a universal VGA block like this one from EKWB -
Universal VGA block
(very important that you do NOT forget that you will need fittings for a universal block. as well as a bit of tubing to add it to your loop)
Either of those two AIO's are expandable, meaning they are powerful enough to accommodate adding another block or radiator to the loop, without any need to upgrade anything else, and both of them offer the ease of a Corsair closed loop AIO, though they are not closed loop.
To add my opinion on this, you won't find exactly what you are asking about, there just isn't anything pre-made like that out there. I've heard very good things about the Swiftech I linked but I've never used them. My rig ALSO has an H100i for the CPU and an H40 and Kraken G10 for the GPU, but they are getting to be too loud and I just don't trust them anymore, plus I just upgraded to an MSI Gaming X GTX 1080 so I decided to go full custom loop with EKWB products instead of switching my Kraken G10 over to the 1080. I have most of the parts here now, and I have to say their build quality is just top freaking notch. They cost a bit more it seems but it was very worth it. I hope you figure out a way to do what you want to though, good luck man!
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