And here is the notorious wire set. The eight spark plug wires are permanently molded into the center ring. If there was a problem with one wire...you had a problem with the whole set and had to replace it as a unit. Big $$$
Here is a chopped up center ring.
There is a way to split the center seam of the molded rubber ring with a razor and insert a regular wire set into the terminals. I will be trying that just to see if it will work. Others have done this with good results in the past.