If the 1992 Grand Am is anything like my '93 Grand Prix coupe, then to remove the rear speakers, first use a flat screwdriver or putty knife and slip it under the edges of the speaker grills, gently pry them loose. They should come right off without any trouble. You can now remove 3 of the 4 screws on each speaker.
To get the remaining screw out of each speaker, you must remove the back seat starting with the seat bottom. Remove the 2 bolts under the front edge and the seat bottom will come right out. Then you will see 2 bolts at the bottom of the seat back, remove those. The seat back is now hanging from the trunk wall, simply lift up and the seat back should be free. Now look just under the front lip of the rear dash and you should see a couple small metric hex head screws. Remove those and the front of the rear deck should lift a few inches. Be careful, the plastic panels on either side of the back window will greatly restrict the movement of the rear deck, but there should be just enough room to get in there and remove the last screws. You could remove those panels first, but they are a serious pain to remove without breaking them, not to mention putting them back in.
When you put in your new speakers, I don't recommend putting that last screw back in each speaker. Leave them out and you won't ever have to pull the back seat out again to change the speakers. Hope this helped.
Steve in Gilbertsville, KY
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