one of the blanking grilles is missing on my GP, I have bought a new one [couldnt believe how cheap it was!]

How does it fit?

does it go in from behind? [snigger... stop it!!]

I believe you have to clip it in from the back.

My old grande had fog lights and when I replaced the fog it had to be put in from the back and screwed in t the bottom of the bumper and just above the fog light.

I removed the blanking plates from my old Alfa 75 to improve airflow to the front brakes.