Battery drain issue

I decided to go ahead and order a replacement. I had to order the replacement alt. It came in today but is not the same as the one on my car. The new (reman) alt has only one space for field but my original one has two. There are two wires (blue and green) that hook to those spades. It is the round back alt. The cases look identical other than this. The guy at AZ asked if I had one spade or two and I said two. Anyone had a similar issue?