Yes that's it, though you don't really need to go to the 48" leader, the 30" is more than enough. They work much better than the other ones, if you bury your line in the back of those it'll never release without a fish biting and if you're fishing deep, it takes some effort to pop them from the boat.
Most of the guys I know, (including myself) use the large scotty planer releases, which is the same clip on a shower curtain ring for running long coppers off of big boards, they'll pull a 500'+ copper all day in heavy seas and not pop the release unless a fish hits.
Tim