The NOS Delco #45N GM #5612437 (8) fire ring spark plugs are high-quality ignition components designed for car and truck engines. Made by AC Delco, these spark plugs feature 4 green rings for added insulation and performance. With a focus on delivering reliable and consistent spark, these plugs are essential components for maintaining and improving the overall ignition system of your vehicle. Trust in the AC Delco brand for quality spark plugs to keep your engine running smoothly and efficiently. Make sure these are the correct spark plugs for your classic. Thanks for looking