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but I believe the difference here is that aisin actually makes the complete water pump FOR toyota, which makes a difference. ...
What exactly is the substantial difference, from a reliability, fit, function, etc, is there any difference? Well, there is the blue box thing.
My guess; Aisin (last I heard has ownership investment from Toyota) understands the market and most owners of ~20yr old rigs are less likely to go to the dealer for parts. So, can give that market to others or sell some of their product in that market? If they compete in that market, why would they sell a substandard part, compromising their name, reputation?
It's not like the Aisin pump is cheap, a quick review of the aftermarket revivals that 1FZ pumps can be had at ~$15. So, they are on the premium end of aftermarket.