Hi people, just brought these as my rear ones where shot! Just had a quick look through the instructions and it's saying to run the off of the hea unit?? Anyone else done this as I was just going to run the wires into the old connection

Did you buy the kit which included wires? If so that is for fabias which didn't have wires run or rear speakers. I bought these as I had no rear speakers. You can just replace the speakers themselves, using original wires.