I think you can get a 22 hanging kit from Lavalock, Gateway and Hunsaker. Seems like folks like all of them.
I went with the Hunsaker for my 18 WSM, mostly because it seemed like the Hunsaker stood slightly taller. In an 18 WSM, the vertical for a full rack of ribs can be a little tight. Even with the slightly higher Hunsaker, I usually hang half racks. Which works fine because you can still fit a lot a ribs via hanging.
Having used the round Hunsaker layout, I think I'd prefer the parallel orientation of the Gateway hanger a little better. But that's just a detail.