I cant say that I have heard of 8mm wires (dont mean they ain't out there tho!). would there be a problem wiring it with regular adequate gauge wiring & on the ECU pentastar connector one of the wires is black/yellow (to coil neg) and another one is grey/black (to the male terminal on the body half of the zigzag connector for the dist pickup). EDIT opps my bad you are speaking of plug wires (I knew I was missing something!)