Peltor muff hygiene kit hy79 - Peltor EarMuff Hygiene Kit for Peltor Select HY79

Not sure why I could get one set replaced on my headphones, but the other one just would not fit into the old space. I know the fit needs to be tight, but just wouldn't work. My whole headphone is rendered useless.
Pros: One fit my headphones, one did not...
Cons: One fit my headphones, one did not...go figure

This review was written in the old system and had content requirements that are different than reviews written today.