Panasonic (my all time favorite company) was the manufacturer of this vacuum cleaner so the correct filter number is MC-V199H aka Kenmore EF-1. They also take Panasonic type U-2 bags but any U bag from Panasonic should work, I prefer the ones like U-6 where you can seal up the bag when you empty them out. Yes the Kenmore type O bags would fit, the code is different because they're made out of cloth whereas type U is made out of paper. I like the Miele type Z bags the best because they used plastic instead of cardboard collars, Panasonic also used to make vacuums for Miele at one point but they let Miele make the bags.