Chevrolet aveo 2009 uk speaker wiring need help

[Alivallo]

Hi there
i have a chevrolet aveo 2009 uk model
i decided to change the original speakers on it and go with some after market jvc speakers.
i got all speakers installed but i am having trouble finding + & - of my speaker connection.
Any help would be great appreciated
Rear right seems to be light blue and dark blue
Rear left has brown wire and yellow wire
Front left has brown wire and blue wire
front right has brown wire and light grey or white wire

Great Pics; looks just like my colors; POSITIVE is always on the "CLIP SIDE" or purchase a Metra 72-5600 Speaker Adapter for Ford Vehicles

according to the picture that would be; light blue, yellow, brown, light blue; Positive is always the lighter color; also if using aftermarket wires; Nickle or Silver is Negative; Copper/Bronze color is Positive. ; test the speaker polarity with a battery; hook the speaker wire to the battery; speaker should push 'Outward' if it 'sucks inward' at first its backward. Question for NooBS on polarity: if you connect all speakers in backward polarity does opposite polarity really matter?