Solutions
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Chickenman's post in OEM style Windshield Washer pump was marked as the answerOriginal application is for 1973 - 1990 Isuzu's and Honda's, but they also fit just about any Datsun that has this style of pump. Not only Z cars, but 510's,1200's, PU Trucks etc.
Trico number ( 11-601 ) is still readily available, and you can cross reference to other manufacturers such as Anco and AC Delco. AC Delco number is 86719. And of course Rock Auto has them in stock.