You might want to include the Ampco fuel pump which was part number 17010-N3625 as well. As a rule, interchangeability is by the brand, but this is a great question. I have all three kinds on the shelf, but have never replaced the diaphragm. The fiche suggests that the part number for the diaphragm changed after 7/73 and does not fit to the former fuel pump. The later fuel pump, part number 17010-N3625 shows fitting an L26 from 11/73 on. It could be possible that the 260Z fuel pump would be the Ampco brand and not the Nikki brand of earlier Z cars. The Ampco pump I have could also be an aftermarket pump of the era, long before the Kyosan model.
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