The Xigmatek Cuirassier-N002
Here we have both Cuirassiers from opposite sides. Both are topped with a ten fin array for additional cooling, each half containing five if those. The Cuirassiers can be separated easily by removing the three Phillip's head screws and gently lifting off one half.
After removal of the three screws, this is what you are left with. The extruded aluminum is molded on both sides to accept the depth needed to nestle IC's in both halves. I would imagine with some modification these could be used for single sided memory, but as you can tell, the Cuirassiers are not designed out of the box to work with less than double sided memory. You can also tell, once split, how each half has a different stagger to the aluminum fins allowing them to slide between each other when reassembled.
Xigmatek used a pressed on approach to the fins. This allows them to be adjusted as well, if you do have any mishaps, or even possibly drop it. The fins can be easily re-bent and adjusted back into proper alignment, if needed.
Looking at half of the fins from the top, you can see there is also a toothed design cut into the fins. This allows both halves again to nestle right into each other and create a good sized, in surface area, fin arrangement.
Just to get another look at the way these are designed. This angle shows the depth of the "shelf" for the IC's and the silicone to be "clamped" into place for each side. If you were going to try these on single sided memory you would need to fill this gap somehow. Now you can really see why Xigmatek says these are for double-sided memory only.