13pin or 15pin 5HHD Auto ???

[Sectech]

This may be a stupid question, but how can you tell a 13pin from a 15 pin Auto. I checked the connector - it has 12 pins, or are
they locating pins or something???
The car is a 05 Crewman m30 4spd and I need a "new" box, but the wreckers have asked whether it is the 13 or 15.
Thanks in advance.