I only know cause I just went throught this exercise a few months ago. Tried to get a round back alt and nothing doing.
Bit the bullet on a square back ( now my emergency spare)
And it looks identical to the one in the photos. Even the poorly cut off terminal looks the same.
My bet is if you remove the screw holding terminal B on you will find there is no insulator. Between the screw and the terminal, install the proper insulator and it becomes an isolated field ( 2 wire to us rednecks) alternator
