adding cd changer to 2000 sable

I want to add a cd changer from a 2000 escort zx2 to my 2000 sable that has a radio with cassette player. the buttons are there for controlling the cd changer, but i nee to know if the wiring is there or do i need and a new wiring harness. and if so where can i find one

the wiring is not there, I tried on my '99 SE that had the buttons but no changer

I went to cdchangersonline.com and bought the 10 disc for my 99 tuarus wagon. it came complete with wiring harness, all I did was plug it in. They provide excellent instructions and all necessary equipment. it's weel worth the money.