M5 1 1/16" 1938 & 1939 Harley E,EL ( 4 bolt air cleaner flange,4 line, 2-348 casting,the "4"cast in with the other numbers, 2 soldered in plugs &... Note that some models such as the M5,M4, etc, had both early 2 bolt & later 4 bolt air cleaner..
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