Opening the Grille?

[Brian]

Does anyone know how to safely open the grille assembly on a '92? It's already removed from the car, but I'd like to open it up so I can install a light inside the transparent part. I see 4 tab slots spaced across the bottom, but only one looks completely unobstructed. I'm afarid that if I start prying at it with a screw driver the wrong way, I'll end up breaking it. At the top, it's hard to see where the black-painted clear plastic part meets the black plastic part. It looks like this is because of a black sealant. Any help would be appreciated.