The ones in the kick panel are 5.25. If you really want a loud system you can cut it out to fit 6.25s. The ones in the back are 4's. Im not sure what the tweeters are I think 1" and 3/4" or 1.25" and 1". For brands I recommend Infinity, Eclipse, MB Quart.. You would get alot better sound if you buy a component set with an amp.
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