40-2504812 Prestolite distributor cap, used on the G3400 6 cylinder Hercules engines.
Hercules used two brands of distributors, Delco and Prestolite. You’ll be able to determine the brand by looking at your distributor cap, the Delco type will use two screws that holds the cap on, the Prestolite uses clips.
This will be item 1 in the Hercules drawing.
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