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Don't pay twelve bucks
The four prong plugs are around six dollars at ************************************************************ and are listed as OE. I don't know about the OE part, but six bucks each shipped to your door is a good deal.
On my airplane we have no choice but to use two prong plugs, and I can tell you getting them gapped so they fire on both sides is tough to do, and in practice only one prong fires. Four would improve the odds of getting multiple spark. I'm changing mine in the S this weekend, having ordered from ********************************az.
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