This is a set of new reproduction AC Delco Spark plugs # 45. These new spark plugs have the correct AC logo and the the 4 thin green rings around the ceramic. These are the large 13/16 socket hex base and has some knurling around the base to make them look like the original. These are new so they are not corroded inside like some old stock that you will find. These come with the crush
washers also. I also have #43 and #44 in my ebay store if you are looking for a hotter or colder plug.