https://www.carpartsmanual.com/datsun/Z-1969-1978/brake/brake-clutch-pedal
According to this site, the pedal itself was the same from 1973 through the 1976 model, so a 260 pedal should work. I think the 1970-72 pedals would fit, but the clutch pedal would be further left than stock. The offset of the pedal itself changed when things got spread out for the larger booster.