iRobot's kit 4812261 combines filters, edge-sweeping brushes, and mop pads for named Roomba Combo j robots. The manufacturer explicitly excludes standard Roomba j7+ and j9+ vacuum models and Combo j5+, even though those names look close to the included models.
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How to avoid a wrong part
Read the whole robot name in the app or on the machine. Keep Combo, the j-number, and any plus sign in your search. If you own a standard j7+, use a separately listed kit rather than dropping Combo from this kit's product name.