best way is to take the speakers out and look at them. i've seen a couple sites like crutchfield that have "Will this fit?!?!" deals where you can look it up, but every site says a different thing. plus you might find that you have more room then you thought and can fit something better in your car by taking it appart and looking yourself.
never heard kicker speakers though, i'm not a big fan of their subs, their amps are good though.