Speakers " used in palio

Can any one let me know the speaker size for Palio 1.9D, I mean speakers size used in front doors and rear shelf. I would like to add speakers to rear door too, is it possible. Any suggestions for speaker set up in palio with out loosing the boot space, I would like to add Subwoofer too. I heard flat subwoofer can be placed under rear seat, is it possible. Thank you in advance.

I am not sure which Palio are u refering to ? mk1 / mk2 or 3 ?

If its like mine ( Palio 2 )
the front ones are 16"

I ignored the rear ones and opened 2 holes in the back shelf for 2 Oval 16" speakers

Installed a 350W 2Way AMPLIFIER BEHIND the rear seat .

I don't think u can place anything UNDER the rear seat cuz thats where the FUEL TANK is

Maybe u ment behind it.