Wiring up rear speakers

[Silverhaze]

Hi, new poster, my missus just got a Corsa B and wanting a few pointers!

The previous owner fitted some 6x9s on the shelf, and removed them before we bought it, so there are two gaping holes.

There's no wiring to the holes obvious, had a bit of a poke about can't see anything.

Any idea which side of the car the wiring goes down to the rear? Will halve my job trying to find it!

Assuming he's just cut it somewhere so I'm going to be removing some panels..

Cheers!

[Silverhaze]

Come on someone must have wired up some rear speakers ffs!