They didn't like the offset the 560mm made, but I truly don't care, as I won't be looking from the top down ... ever.
I believe I posted some pictures somewhere when I first got the case, but let me see if I can dig them up.
The things is, though you can mod the top to fit the 560mm easily, the one I have with the Extended Top cover (39mm I think?) they extended and centered the vent hole pattern in the cover, so it's open over the whole radiator. If I find the pictures you'll see what I mean.