You can NOT use any other type. MIXET is long out of business, so the only thing you can get is parts. Why doesn't that Danco handle you bought fit your stem? Maybe the stem is damaged and needs to be replaced. If you turn off the main water, remove both handles, then the large chrome sleeve unscrews to release the cartridge. There are about 3 or 4 versions, so you will have to take it to the store with you. Most places, including HD, carry Mixet stems.