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My MF-135 parts book shows a single element air filter for both horizontal and vertical filter canisters for gas engines. The horizontal canister was used on tractor serial numbers 641 023 533 and later. Its MF number for the element is 1 032 762 M91. There is a dual element vertical can filter too, used prior to 641 003 797. That has two elements 1 029 959 M91 that is listed as a tube assembly, and a filter element 1 029 945 M92. Between those two serial number the single element was the 1 029 945 M92. Diesels used the 1 032 762 M91 filter, but before SN 9A 105179 for 8 speeds and before 9A 108723 for 6 speeds they used a different canister without the inner element. Otherwise the diesel had the second safety element 523 419 M92. So the gas element change with time, but there never was a two element filter for the gas engine. Only for the diesel. The 9A serial numbers came later than the 641 serial numbers. There's no room in my horizontal filter canister for an inner filter element. Its a gas with Z-145. Oil filter, I use a Fram C3 equivalent. My parts book shows a kit of three filters with gaskets comes under a part number 1 014 219 M92. Doesn't show a part number for a single filter. Gerald J.
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