Product review (4 stars): Right fit for my humidifier, odd number to include in a set though.
These fit my Sunbeam SCM631 without issues and is working well.

I question why they're sold as a pack of 3 rather than a pack of 2.  AFAIK none of the Holmes or Sunbeam humidifiers use 3 of these filters at once.  You're either left with an odd filter that is not used, or are forced to by two of these packs (which I did),