VY Commorore Stereo

I want to fit some 6"x9" speakers into the factory holes in the rear parcel shelf. Does anyone know where I tap into the stereo wiring to connect these?

if you open both the front and rear doors on each side you should find the "black insultation" covering the wires down the bottom so that the wires dont get damaged.. pop it out and locate both the "brown/black" wire and the "green/blue" wire.

Make sure that these are the correct wires before cutting them, and then join your extension wires to them to allow wiring for the 6X9 speakers.

You aware you need grills for the parcel shelf???
Otherwise you will just get muffled sound.

They are between $19-$30 at most auto-sound places.