I went to Autozone, but they said they didn't have anything for this job. So I made a water pump holding tool out of an aluminum bar from Home Depot by drilling a hole in it to catch a water pump pulley bolt for leverage. It worked easily and right away (together with a 32mm or 1 1/4" wrench), and now I have it for next time (used it 3 times already since making it.)
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