Tough switch to find, it seems. Looks like Panasonic (a.k.a. Matsushita) bought out NAiS/Aromat, assuming they didn't already own them and just changed the name. The complete Panasonic Electrical Works number for the switch is AH76515559F. I can't find any distributors in the U.S., nor can I find anyone who includes the brand(s) in their cross-references. You might have to try to match up the specs and sizes with an easier to find brand, such as Cherry, Omron, or Honeywell. The required force spec might be different, so if you find something that'll drop in, you're probably better off changing them all out for the sake of consistency.