I think it's even nla with Hobart too. IIRC a recent thread indicated that these components are nla for the 21 series, but I think Hobart was more involved with series 18 and may have chosen to support those models longer. There's no harm in contacting Hobart to find out if you haven't already done so, or our resident Hobart information resource SteveT will likely post the answer here soon enough.