They make finding the right filter a puzzle so I am noting here:
Research Links
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Model 113 Accessory Page
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113177120/113177431/113177440 filter page – wrong filter but shows which other models use the same filter
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113177120 Manual PDF
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Sears 17816 red stripe filter fits the 113177120
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Fits all Craftsman Sears Wet Dry 8, 12, 16, and 20 gallon vacs sold since 1986.
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Also fits Craftsman 6 gallon models: 113.177431, 113.177440, 113.177120, 113177431, 113177440, 113177120
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Replaces "Red Stripe" or "Red Line" Filters.
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Measurements: 6-3/4" OD, 4-1/4" ID, 7-3/4" Tall >>>> This is much too tall to fit
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Replaces Sears item number: 00917816000, 00917912000
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Replaces Manufacturer Model Number: 17816, 17912
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17612 filter – looks like it might be the filter – It's for the 4 gallon units but somehow my 6 gallon unit is using a much shorter filter than depicted in the manual