Joel, My series 1 car doesn't have that bumper thing either and that rear spoiler is much different than the one on mine ( as are a bunch of them )
We've discovered that almost all of the cars even in the same series have slight differences.
BUT....depending on the car's history it may have gotten "retro-fits" along the way...My car has "eyelids" over the doors and most series 1 cars don't ( according to Dan ).
...What I'm getting at is that finding the mold or a piece in the container is the easier part, will it fit?...that's the hard part