They don't have them for the 22. I'm pretty sure the company stopped making them because of quality control issues, but you can still get them on ebay. I looked into getting them a while back, and the reviews were mixed. A few said they worked, and most said it was either junk or worked well after heavy modding. IIRC, one of the most recommended mods made the stacker go upside down on the bottom instead of the top.
Weber One Touch Gold
2001 Weber Genesis that is no longer used since the OTG