BDS Suspension makes a body lift too, it's very similar to the Sky and RRO kit, but it includes all the bumper lift brackets(not that you couldn't make some) It's just a more complete kit for the bolt-on users.
I have the Sky kit too, just haven't put it in yet, I really don't like the size of the blocks, they're only 2" diameter, I'd rather something bigger so I'm going to cut some 4" diameter ones out of MDPE/UHMW with my hole saw. People will say that the body lift blocks will go up through your floor after time, that's because you'r going from a 4" bushing pad to a 2" hard plastic block, I'm hoping keeping the same size will help.