fiesta zetec 5 door rear speakers

[bridgo]

ive got a 2011 5 door fiesta zetec , it has a four speaker system only in the front ,ive recently fitted power fold mirrors and had them activated in the cars ecu i got the rear spekers activated on the system also so now it has the fader option in the audio menu ,ive removed the rear door cards and there is no wires there for the speakers.
has anybody else fitted speakers to the rear doors , i dont want to remove all the trim to remove the radio to rewire right back to the radio so might just connect them to the front speakers. im wondering if the rear speaker cables are hidden in the door pillar where the looms run through.

any help would be great.