The problem is that this board has 2 hooks and not 2 holes for fixing the NB heatsink. The retaining clip provided with the HR-05 doesn't work due to the hooks being positioned incorrectly (or the clips - depends how you look at it).
I finally got the Extreme Spirit II installed. Not the easiest to install, but does the job.
I would recommend checking the base for flatness before installing, however. I bought 2, and 1 is extremely concave. First noticed due to the reflection (lines of light radiating out from a central point) and then after installing on the SB - only the 4 corners of the SB ihs were in contact.
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