What kind of nut was used to hold the air filter on the 1950 Champion? wing or standard

1950 CHAMPION -ORANGE COUNTY, INDIANA
I'VE SAVED SO MUCH DAYLIGHT THAT THERE'S NO DARK TO SLEEP IN ANYMORE!

1950 CHAMPION -ORANGE COUNTY, INDIANA
I'VE SAVED SO MUCH DAYLIGHT THAT THERE'S NO DARK TO SLEEP IN ANYMORE!
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