I recently found out that there were some variations on these washer bottles for Datsun 240Z 260Z and early 280Z cars.
Early one has 2 flat head connector (+-) and later one for 260Z and early 280Z have round harness connector.
And they look identical as far as shape and motor.
Now, the far right one was made in 1990′s by Kanto Seiki and there is few differences. Obviously, they changed the mold of the bottle.
The font for “Kanto Seiki” and “Company Logo” is diferrent and the cap retaining nipple has a split so that the strap of the cap comes in center.
There is “full” line at the top on the recent production one. Therefore window washer label is moved towards the top of the bottle.
Now the motor looks the same except for the color diference.
At the bottle, one corner is more rounded for whatever the reason is….