We already answered your question in your post from yesterday. Th alternators only have one field. Early versions had one end of the field grounded internally in the alternator. Later versions had the field wire, and a second wire which grounded the field through the voltage regulator. You can run a two terminal alternator in an earlier car by grounding one of the terminals and putting your field wire on the other one.
The picture that you have shown has this already done. There is only one terminal, the other one is already grounded to the alternator frame. Put it in, hook it up and go.