Welcome to the world of alternators....
Anywhere between 5 & 1 wires, internal/external regulators, various mounting hardware & pulley configurations as well as a myriad of different plug & connection options.
Also, battery, field & stater connections can be labeled in a bewilderingly large number of ways.
The only thing that is standard is the PITA if you try to modify one to fit.........I have done this a few times. /ubbthreads/images/graemlins/nopity.gif