AC GM Spark Plugs
 

AC GM Spark Plugs. Five different types. AC43N with four thin green lines, AC44 with four green lines with the top being thicker, AC44TS (tapered seat with extended tip) with four green lines with the top being thicker, AC45 with four green lines with the top being thicker and with four thin green lines, AC45S (extended tip) with four thin green lines, with four green lines top one being thicker, and one box with no lines. $80.00 per box plus shipping.