As far as I am aware 7's only had door speakers (in the forward lower corner if you do not have anything currently fitted). I make do with these (5" IIRC) but then I am tone deaf. Others of a more musical bent have fitted fancy slim speakers on the rear bulkhead too. Not sure what they were but they might show up in a search.
Alan Saab 9-5 2.3t Vector Auto Estate Stage 1 Saab 9-3 2.0 SE Turbo Convertible '81 TR7 DHC