You could do that, if anything seal the doors up and use some MDF as a baffle over the hole the previous owner cut with a hole just right for whichever speaker you choose.
I think you'd be happier with a 6.5 componenet set putting the mid in the door and tweet on the dash/door/a-pillar sound wise than you would iwth the coaxils but anything's any improvement over what you have now.
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