@ Johnny, those are more height specified that width.
@ Mako21
I believe that you will have to take the board out to mount it, but IMHO that is a small price to pay to have nice temps with a small cooler. C'mon man, how lazy can you be?(;
Also, the ones that you attach to the back are less prone to reseating issues and dissipate the pressure over the board reducing the chance of a broken mobo.