i'm not 100% sure, but i think that you might have to take of the entire front dash pad. on alot, not all, of pontiacs the speaker grills are attached. good luck. tell me what happens.
i got a 92 gp too...there are 2 screws under were the instrument panel is, then u gotta take off the glove box, then if u look up in the glove box u will see a little hole, u r gonna need a 9/32 bit to take the bolt out...after that u just gotta pull out the panel...hope that helps