The spark plug shown is from the NGK Laser Iridium series, P/N DILKAR7H11GS. It is a 14mm hex with an insulator height of 51mm and a thread diameter of 12mm. There is some play but that is due to the 12 point design and it fits this 14mm plug. For reference, this spark plug is for Acura TLX 2016 with 2.4L engine, but also fits the following models: Acura ILX 2016-2020. with 2.4L engines 2015-2020 Acura TLX with 2.4L engines 2013-2017 Honda Accord with 2.4L engines 2015-2019 Honda CR-V with 2.4L engines 2016 -2020 Honda Civic with 2.0L engines bought it for less than $5.50 about 4 days ago but the price has gone up since then. **UPDATE 1/27/2021 - I changed the spark plugs over the weekend and these were a few cons: 1. A 12 point head will not fit a hex head. When tightening by hand, there is an easy play.2. The 3/8" head is not as grippy as older models. This head would not come out after I pulled the head extension and I had to unscrew it with the extension.
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