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NGK TR6 part # 4177 at advanced auto...dont get any other ngk's they prolly wont even list it for your car so have to ask for TR6 or give them the part number
don't forget apparently you can ruin the threads on the cylinder heads, my haynes manual says 7-14 ft-lbs of torque, just for your refrence just finished replacing all of them 10 minutes ago, used motorcraft ones and worked just great! fixed my cylinder 5 misfire