Skyjacker used to sell it under the part number CC-401. The entire kit is CC-401K with add a leafs and CC-401KS with softride spring packs.
I haven't seen it sold separately for a decent price in a while though. It's weird because the whole kit has actually gone up in price since it came out. I paid $1200 for mine and they seem to be around $1600 now.
The rancho has more rear parts than the basic skyjacker. Skyjacker is just add a leafs in the rear unless you upgrade to the full leaf pack which IMO is a waste of money, just soa it and be done, more lift, more flex, better ride and a local shop will prolly do it for less than the price of the new leaf pack if you can't do it yourself