Help with my honda accord LX 88

[Honda88]

Hey guys, I'm new

I have question does anyone know the speaker size of an 88 honda accord LX? I tried looking for it only but I get different sizes. Most say there 6.5". So what are some good 6.5" coaxial speakers?

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[Honda88]

I found out that size they are, the door speakers are 6.5 and the ones on the rear deck are 5 1/4 but 6.5 fit in there. Now my question is can an amp give different watts per channel? Because the speakers that I want for the front are 60watt rms per speaker and the back ones are 100 watt rms.