This has the original box and the original sticker with a card explaining how these work. Very rare. There are 6 spark plugs unused in the box. There was originally 10 in the box. The spark plug number is UF-11Y. Engineered especially for Ford Mustang, Falcon, Thunderbird, Mercury Comet, Lincoln Continental. Great for collectors or just to use the spark plugs and have a rare box and sticker.
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