Look up your part number through Case. When I rebuilt the pump on my Super C last year I was able to find quite a few kits online, as well as being able to order it through my local case dealer.
I'll see if I can find the actual place I bought my rebuild kit. It was some website that catered to International pickups. They just happened to have a NOS rebuild kit and it was the best price I found anywhere. I even posted pics (think they were lost with the website update) of the packaging...it was like a trip into the past.
Keep in mind there were two different pumps available for Farmall A and C - Pesco and I think the other is Thompson? The kit above is for the Pesco, which if I recall correctly was more common. You'll need to verify which one you have.
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