Denso T20EP-U are the easiest to find that will work great.

I got Bosch H9DCO from my local dealer for $3.40/each about 3 months ago. Just go to the local dealer, ENSURE it is NOT HR9DCO. If it is, ask them to find the non-resistor and have it shipped to their dealer. The plugs are still out there. I'd recommend buying 2-3 sets now before prices skyrocket and they really do become difficult to obtain.

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