'02 Impreza Wagon speaker questions
 

Sorry if this has all been covered before but can someone help...

I have upgraded my front speakers to infinity kappa 6.5" and am in the process of adding an amp under the passenger seat, which is all going nicely.

What speaker sizes do I need for the rear doors - i'll probably stick to kappas as they seem to be excellent.

I've also noticed 2 speaker-looking mounts in the boot just behind the seats on pillars. Are these for speakers and if so, which size again? Its a pain not being able to wack 6x9s in but I need to keep my boot space and keen to make everything fit in nicely and not stand out. Thanks.