Here's how to fit 2 Koolance HTS-PMP400 heatsinks fit to the EK Dual DDC V2 - with a little help of a dremel.

1) One of the "sidepods" on each of the metal frame has to be removed:





2) Here's the frame after cutting of not needed bit:



Cut piece vs uncut:



3) Here's the clearance after cutting and mounting:



4) Here's the heatsinks on:



5) Finished product - looks quite nice - and definitely much better than my old plastic housing cut with a dremel