i didnt take any pics sorry,
you will probably be ok not grounding the
LOC, it might just be there to get rid of any interferance. i would wire it up without the earth and see if it works. if it doesnt, connect it.
i took off the rear armrest panels to get to the rear speakers then connected in a new wire to the speaker cable using some connector blocks and ran it down behind the panels to the boot then put the
LOC underneath the carpet and polystyrene behind the rear seats.
i would take some more pics but im away from home from early tomorrow on a training course for a week. if i have any time before my lift gets here i will try!