Also what are FORD RACING 9MM SPARK PLUG WIRES i would be putting these on my Bronco....what do they do....do i need them?
Spark plug wires. The Ford 9mm wires are bigger then the normal 7mm ( I think ) wires. And when you have bigger then normal wires, the wire separaters that hold the wires on the valve covers need to also be bigger, hence the wire looms. No, you don't need the larger wires until you add to the ignition system and increase it's electrical capacity. But they do look better. Probably can get regular size wires in the Ford blue, too.
