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This is a Box of 10 Autolite 55 N.O.S. Spark Plugs.They replace Champion N12Y N13Y AC-44 XLS XLO NS+C44NS Motocraft AG42. Plug Specs; Heat Range 5 Power Tip 3/4"" Reach 14mm Thread.. I have 15 boxes.Price is for 1 box of 10.Free Shipping.