Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

hi there im trying to wire my speakers up to my wiring loom at back of stereo but i dont know wat colours the wires are for the back speakers as i havent got any wires going to the back of my car
does anyone know which wires i should use so i can run my speakers to my boot ??

Splice the wires in the boot thats what i done easier to work at imo