That's a good find, for sure.
I would try to squeeze that thing in a res. Do not leave gaps between it and the outer wall.
Here's why: because it's a fin design, it's a flow restrictor. If you leave that gap on the outside, you might loose some of the cooling effect as the coolant goes right around it.
You might want to experiment with which fins to feed. I believe that the bottom (closest to CPU) fins will provide good cooling, but the top ones are probably useless. Alternatively, you could cram some silicone sealant in the top fins (it'll be easily removable).
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