I believe they're a standard 6.5 inch round. I got a pair of infinity's which were a straight fit.
Whatever they are they're a doddle to fit, just whip the back of the rear seat off, pop the parcel shelf up, speakers bolt in from the top so it's a bit of a narrow angle, then it's just a case of drop the new ones in and fasten them down, very much the reverse of removal
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