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What model year uses copper resistor plugs, and why should anybody pay $20 for a set of plugs that costs $15 at the auto parts store down the street.
You still failed to answer the first question. Which vehicle do they work on?
Before you start up with me keep mind you can't even quote prices on the stuff you have listed in your other thread.
As for ebay and parts, don't get me started. I just spent the last 3 years working in auto parts retail. Ebay is the last place I'd buy spark plugs. Those things are grossly overpriced on that site. Most Autolite copper resistor plugs I'd sell were about $1.67 each. $1.67 x 8 = $13.36 + tax total.
And, my reading was just fine. All I did was comment on how $20 seemed high. I was just warning you so that your wouldn't get butt hurt when somebody came in low.
And the answer to my question is?