I looked in my parts book and the spring is the same on the H and M, but the driving studs have different part numbers, so they have to be different and probably will not interchange.
Without the driving studs the water pump impeller is not turning and thus not pumping water. A cheap and easy alternative is to get a couple of the right sized bolts, cut off the heads and used them as the driving studs, just use jam nuts to hold them tight.
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