Originally Posted by Diablo3

All 370Z's come with a pair of small diffusers that sit in front of the front tires that are dealer-installed. Lie down on the ground in front of your car. There should be a black plastic thing hanging down in front of each wheel. If they're not there and not in a plastic bag in your trunk, call the dealer.
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Can you expand on that more?
There is supposed to be a bag with what in them inthe trunk?
And in a bag hanging in the front wheel wells?

Just need this explained a little more, I'm going to check when I get home. What exactly is supposed to be there?

Are these spares/backups?