So the idea is the bottom holes (actually the bottom hole and the 3rd from bottom) bolt to your stock D-bracket mount holes on the axle, and then the D-bracket mounts to the upper holes (top hole and 3rd from top) instead of the stock location. It's not actually bolted up in these pics, I just sorta threw it together to give you the idea.
:edit: after looking at the pics, it doesn't actually sit that high when properly installed, about 1" lower. I had it flipped around upside down.