To ensure reliability, purchase GM part # 9421748 Plug .687 Plug Cup. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Buick Century, Skyhawk, Skylark models. It fits Cadillac Allante, Deville, Fleetwood. It also fits Chevrolet Cavalier, Celebrity, Citation. This also fits Pontiac 6000, Fiero, Grand Prix.
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