Get a Power 4 wiring kit from VIBE AUDIO and you will have all you need to do what you need. I work for VIBE so if you want any stuff let me know and I will sort you a good price.
If you want a cheeper solution go to Halfords and get a FLI AK10 wiring kit these are made by our sister company.
I removed my 6track from under the driver seat and put my amp under their then all I had to do is run the speaker cable to the boot.
I used a Power4 kit, MB3 amp, Slick 40 in the front doors slick60 in the rear doors, Slick69.2 in the rear quaters and to finish it all off a CBR 12 TWIN Sub in the boot. it sound's like the dogs b's.
Have a look at vibeaudio.co.uk
Trevor.