The Spark Plug Wires are custom fit for Bonneville'* from Taylor. E-mail me with your car Year/Model so I can give you a price w/ shipping for the spark plug wires. Also the color would help, there is black/blue/red.
As for the spark plugs, running NGK TR55'*, copper is also one heat range colder as you stated. But because it is copper, if the combustion chamber gets too hot (before detonation), the copper will melt and the gap will be closed and there is no more spark so that detonation can be prevented. The copper doesn't really melt every other week, its just say you maybe that one time there could be bad detonation and even before the knock sensors can react, the copper would have melted and saved you engine. I would rather spend a dollar on a copper spark plug and change it wherever it dies than have a piston explode or something that could cause bad damaged.
Hope that answers you questions.