On the 5 door, the blinds automatically allow for the rear seats to move independently back/forwards & recline (so there's no gap between the back of the seat and the parcel shelf). It couldn't possibly replace the parcel shelf because it's facing the wrong direction.
I havent got one in my 02 3dr 1.8 dynamic could you post a pic of it please my rear seats are nearly always down and my boot is usually full of stuff and my shelf is stuck in the garage