Cardomain.com will apparently list the Prius-fitting speakers (I recommend you verify this claim). The size of speaker according to them is 7".

If you want an informed 'opinion' regarding car audio though, I recommend you giving a shout out to a 'tbaleno' member here if you see him. He'd probably be happy to give you some pretty impartial, insightful opinions if you ask, imo.

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