I can't tell for sure, but it looks like it's a spacer kit that's either only topout or only preload. What attracted me to a couple of the other kits is that they "split" the lift between topout and preload in order to minimize exaggerated suspension angles and too-stiff spring rates.
That's a topout kit. It just bolts to the top of the shock assembly, then to the tower.
It's just like the procomp kit. I haven't used the kit personally, but I've seen some people on this forum with the procomp kit and it seems to work just fine.