They look for this....I got pinged for it last time I went to the pits.

The inspector was awesome though. He passed everything else on the car and told me if I could go home, put the wing with the 3rd brake light back on and get back to the pits within the hour, he'd tick it off without me having to wait in line again (and also without slugging me another inspection fee) and I'd be sweet to go

Can't speak for everyone else i.e. I don't know how lenient the inspectors will be, but just make sure its all fitted up before you go and you wont have any troubles.