Re: 5 speed trans, please look & tell me it is the
For you, I guess the drain plug really doesn't matter too much. The key things are the number 60 cast into the right side of the case and the serial number starting with the letter F. That would be the "correct" transmission to use.
Although, since you have the Datsun engine in your car any 5-speed from a 210 should work. The bolt patterns are the same and i believe the gear ratios are the same as well......it's just that the Spridget kit was designed for the 60 transmission. It probably doesn't make any difference for you or me (mine is a 60, FWIW).
Anyway, the 60 on the case is pretty easy to see, so this guy should have no trouble confirming that with you. The numbers are about 3" tall, so again, easy to spot.
Good luck.