Some really bright guesses...but no

(Ooo...was there a sneaky little hint somewhere in there?)

Brake light

Noo - but getting closer

Footwell lights

Ooo...soo close!!

Illuminated sill plates?

Not quite there yet...

But it is something that you won't be able to see when you're driving

Boot light?

Rear fog?

Boot light?

That's the one :)

Woo!

Ok:

This ain't no croc.

Gaiter

Haha, well that was over quick.

I was thinking gear gaiter, but it is close enough :P

Ok-

Clear snake

Hmm, all I can think of is that Anaconda song now! <_<

if clear snake is the next one than ill guess fuel hose

Nope.

Coolant hose

Nope

Brake line cover

Nope

Exhaust

Nope

Washer bottle thing pipe

Nope