Dennis, I may have found something to help out with the docking ports on the Enterprise. I have found a reference photo of the docking port on the ship. It is Bay 4 on the Port side. It is designated Bay 4 for there is three other ports on the saucer and one on the opposite of this one on the secondary hull, this is only a theory, but I hope this helps. This is from Star Trek: Phase II The Lost Series
by Judith and Garfield Reeves-Stevens
page 70 if you have the book. I can not upload the picture but if someone has the book they would see what I am talking about.