2001 YRV, Where to put rear speakers?

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Hello all

Just purchased an Australian delivered Daihatsu YRV. 2001. 1.3l NA.

For the life of me, I cant find where the rear speakers go?! Maybe I am blind!
I did a quick search on this site to see where they go, but maybe I am using the wrong search string.

Can someone advise where the rear factory speakers go? (mine have none)
If this is a standard.
What have people done to add rear speakers without having to kill off the fold-ability of the rear seats. (case of mounting them in the hatch??)

Any pictures would help.

Rgs

Pat