These filters DO NOT FIT the Skuttle receptacle. They are 4 15/16 inches thick (i measured them) and the Skuttle filters are 4 13/16 inches thick (and fit tight at that thickness). The extra 1/8 of an inch stops them from being able to slide them in without crushing them. DO NOT BUY THESE AS A SKUTTLE REPLACECMENT.
We have an older filter box and the filters are becoming hard to find. The big box stores started selling a model that I had to assemble myself and it was flimsy and a pain. I'm extremely happy with my filterbuy filter, we have noticed an increase in air quality and decrease in dust.