Seems like you're confused about something.
In every entrance, you'll find a main speaker. On top of each of them is a tweeter. Take care not to rip the cabling to the tweeter when you remove the door card; the main speaker remains in the door, and the tweeter takes the card with it. The primary speaker can be simply unplugged, however getting to the bottom is a bit of a pain.
The panels in the back cargo space are identical, depending on the 639 model. They stand out.
The speaker grills are a great way to distinguish between them.