AutoliteAPP985 Double Platinum Automotive Replacement Spark Plugs (4 Pack)

Is this just one plug for 6.79?

I am thinking about the 2x platinum or iridium for my 99 wrangler tj 4.0 that needs 3.0-3.5 gap. do these need to be re-gapped?

Do i need to use anti-seize to install these on my 2000 jeep wrangler tj 4.0? if so, what kind?

Is this a pack of 1? The box says contains 4 pieces?