40-2504810 Prestolite distributor cap, used on the G 2300 4 cylinder Hercules engines.
Hercules used two brands of distributors, Prestolite and Delco. Youll 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.
