Front door speakers are 6-1/2" and you can go nearly 3" depth without problem. The door has spacers that the speakers will drop into.
The rear speakers are 4" not sure on the depth. Wouldnt even bother upgrading them.
Dont worry about the resistance, it wont matter. Just make sure they are efficient. Look at the focal polyglass line of speakers. They are insanely efficient at 94db!
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