Hi there -
I read the article in Grassroots you're referring to (lastest issue). The impression I got is that you'll have to file them yourself.
Along the same line, I have a tech tip for you. pay attention to where the gap is facing as you screw in the plug, You want the gap facing towards the center of the chamber rather than the wall near the plug hole (follow me?) That way the flame will be facing the whole of the chamber as opposed to the spark plug having "its back" to the chamber.
You may have to use shims to position the plug the way you want it.
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