This is the Brava / Bravo setup:
Standard system - 4 x 15W
Front:
2 x tweeters (dash, 1" or 1.5", 40W)
2 x elliptic (oval) mid-woofers, (door, 130mm x 180mm / 5" x 7" 30W)
Rear:
2 x full range (parcel shelf, 130mm / 5.25", 30W)
So the door speakers work with the tweeters to give the full range, and the rear speakers on their own give the full range. The front door and rear speakers are different sizes and work slightly differently.
To Gregovic: the standard connectors are a square yellow item with 2 sockets for the blades on the rear speakers, most ICE or car spares shops should have them if you take your speakers with you to check.