NAPA is the last place I'd ever look for a specialty item. Even if they could locate an old part, it would pass through four hands before them - and they'd probably charge a rediculous amount for it. I just bought a bearing down at NAPA (in weak moment) and paid $29 for a common little 6202 ball bearing. I just bought some spares on-line and paid $1.50 each for same bearings - even the same make and #. So, how does a $1.50 bearing become a $29 bearing?
Water-pump parts are usually generic. Rebuild companies rarely order such parts by OEM #s, they just fit to size. And, there are many newer type seals that elimate the need to repair or replace old impellers that are worn.
That all being said, there were many mag-drive aux. water-pumps used on Hercules engines - I've seen them on a few Cletrac Generals and Leader tractors - late 40s - early 50s.
Zimmermans's is still the place to try first.
Here's a Hercules chart from my 1951 Tractor Field Book and it shows many Hercules with the waterpump available as an option on thermosiphon engines.
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