The skunk2 kit is just for the front. The rear is much simpler to adjust, so the kits for back there are much simpler. All you really have to do is space the upper control arm a little further away from the body and you can compensate for negative camber.

I think King Motorsports sells a rear camber kit that's similar to the skunk2 front kit, but it's like three times the price of everyone else's.