Do they just pop out? The metal grills under my front most louvres (92 GTA) are loose and rattling around.
Annoying rattles suck.

 

You need to take the hood insulation off, then you'll see a bunch of pegs that have sort of nuts on them. You have to twist them off, being carefull not to break the pegs. I have to get some new louvers for my Camaro but that won't be for a long time. Good luck.

 

Thanks!