Help needed with adding 2 more speakers at the back

[Shadowfox1983]

I have a Toyota Vitz 2005 with the Toyota ND3T-W54 stock DVD / Nav. At the moment I have only 2 speakers on each doors but I want to add 2 more at the back. I think this model is surround so adding 2 speakers wouldn't require an amp. I am clueless when it comes to this so I don't know what I'm doing. All I need is to find the 2 speaker wires to connect it too if it's possible.

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