Hi,
If you look in the footwell up on the "A" post you will probably notice a black blanking plate they fit there, normally covered by the hard board trim panel.
I have them fitted in my car - they are great for getting cool air into the car as they take air from the nose of the car inside the front wings.
Cheers
Ian
Ian Freeman
1979 TR8 DHC California car that never crossed the pond
1962 Triumph Courier