I tried the 5/8" and it did not fit. So i went to Autozone and they had no idea and they had no 2007 Mustang spark plugs to check the size. So I bought an 18mm and it did not even fit in the head hole. So what size? So i don't waste my time. Thanks.
9/16
how many miles do you have. are you aware of the spark plug change nightmares if you have allot of miles?
I was wanting to change my plugs soon. I have about 27,300 on my 06 GT and was wondering about the PROBLEMS? Plus is there a specific plug that everyone is using?
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