EK's UD7 chipset block is a perfect fit for the X58A-UD3R, as is Mips'.
There are no mosfet blocks that will fit, without modification, however. The closest is the Koolance MVR-40s with modified plates.
I spent months researching this, and despite getting resounding "NO"s from Gigabyte, EK, Mips, etc. they do fit.
I've got a spare UD7 mosfet block if anyone wants it for twenty quid
Does the MB block limit the flow much?
I want to do GPU, CPU and MB in one loop.
The plan was Res > Pump > 240 Rad > GPU > 360 Rad > CPU > MB > Res