Agreed, PTO journal on the M20 is larger. OP states his son is saying the M18 is larger is his case. Perhaps he is confused with the information given to him, or his tractors engines are no longer stock. The M18 should be 1/8" smaller than the M20.
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149, 2072, Original, 1772, 1782, #1 cart, Parker 48" sweeper,
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