Product review (4 stars): Amazon Saved the Day
My humidifier is an older model - finding a filter for it was next to impossible.  Was worried I would have to buy a new humidifier simply because I was unable to find replacement filter in my local stores.  Did not want to replace a perfectly good humidifier.
As always, when I can not find what I need in a regular store it is "Amazon Time".  Sure enough --  Amazon saved the day.
Fits perfectly / made well / reasonable price.