
I bought this for a 14mm spark plug and the hole in the center is not big enough to fit the top of the spark plug. I'll probably buy another one and try again. As you can see from the attached photos, the Denso SC20HR11 does not fit well in the magnetic spark plug socket. I think they made a ton of these spark plug boots. I will return this defective one and get a replacement if it's still the same.

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