Roundback vs. Squareback alternators?

Got stuck years ago while traveling.
I got 3 rebuilds in a row with the terminal cut off, like that picture above. Finally found out from Napa, they were cut off intentionally so you couldn't connect to it. Single field only.
The picture above where the one terminal is circled is the one I removed that washer from because the other one matches with what I have on the roundback so I couldnt mess with it. On my picture of my roundback the grd terminal is like the circled one, and it has no washer in it either so by removing the washer from the squareback circled terminal (above) it was identical to the one I removed from the car.

The roundback in the car I had tested by O`Reilly auto and it failed. I put the Napa squareback in last night minus the washer on the circled terminal and it still isnt charging.