The real GM inserts for 96/97 are hard to find, and expensive. Hawks has one (only) for the driver side and asking $124.
www.hawksmotorsports.com
I saw someone selling 96-97 "chrome" versions for $90 a pair. They could be sprayed with flat black to look more authentic. But I can't find the link.
The grilles for 1998-2002 are easy to find, but are a different shape, and have a hole on each end for screws. No screws on 1996-1997. They have tabs that snap into the notches on the hood.

96-97 Trans Am Ram Air Hood Scoop Screen, Driver Only, NEW GM
96-97 Trans Am Ram Air Hood Scoop Screen, Driver Only, NEW GM

I saw someone selling 96-97 "chrome" versions for $90 a pair. They could be sprayed with flat black to look more authentic. But I can't find the link.
The grilles for 1998-2002 are easy to find, but are a different shape, and have a hole on each end for screws. No screws on 1996-1997. They have tabs that snap into the notches on the hood.