japanese-centre-console-t509840.htm
Hope the translation guide helps.
If one of my speakers were blown, i would replace the two pairs. For example if its my drivers door speaker I would replace both the drivers door and the passenger door with the same units. To determine the impedance i would remove the good speaker and measure using a multimeter. Then i would exhaust google and even contact nissan to try and get more details on the oem speaker so i buy as similar a speaker as possible. The alternative isto guess, but you may run into soundproblems if its too high a wattage rating and if the resonance is different.