I have a pair of these, used to be on my own car until I replaced them with a different shield.
If you have a 1991 to 2001 NSX that doesnt have front fogs, then these little shields will cover up the unsightly gap that can be seen after the fogs are removed. They are a US part and when I originally was trying to find out about them a prime member sent these pics:
This is an old pic from a US car.
They cost me £70 new in the UK, I'll take £30 for the pair.