Bosch OE Fine Wire Double Platinum Spark Plugs feature a platinum firing pin and ground electrode inlay that provide 3X longer service life compared to standard copper plugs Unique 360 degree, continuous laser welded fine wire platinum firing pin design delivers better corrosion resistance, ignitability, and performance Nickel-plated rolled threads provide superior resistance to corrosion and do not require anti-seize for installation Bosch Double Platinum spark plugs are pre-gapped at the factory and ready to install right out of the box - gap adjustment prior to installation not required Compatible with select vehicles including, but not limited to, the following (Engine affects fitment - verify fitment details with amazon confirmed fit fit checker above): BUICK: 89-91,96-01 Century, 88-90 Electra, 88-91,94-95 LeSabre, 91,94-95 Park Avenue Compatible with (continued): BUICK: 88-91 Reatta, 90-91,94-96 Regal, 88-91,95 Riviera, 89-91,96-98 Skylark; CADILLAC: 87-93 Allante, 84-95 DeVille, 84-94 Eldorado, 84-92 Fleetwood, 84-94 Seville; CHEVROLET: 97-00 C2500, 99 C2500 Suburban, 97-00 C3500 Compatible with (continued): CHEVROLET: 98-02 C3500HD, 03-04 Cavalier, 92-96 Corvette, 99-00 Express 3500, 00-01 Impala, 99-00 K2500, 99 K2500 Suburban, 99-00 K3500, 96-01 Lumina, 94-96 Lumina APV, 95-96 Lumina Van, 97-01 Malibu, 96-01 Monte Carlo Compatible with (continued): CHEVROLET: 99 P30, 95-99 Silverado, 95 Suburban 1500, 00-02,11-13 Suburban 1500, 04-08 Tracker, 97-01 Venture; GMC: 97-00 C2500, 99 C2500 Suburban, 97-00 C3500, 97-00 C3500HD, 99-00 K2500, 99 K2500 Suburban Compatible with (continued): GMC: 99-00 K3500, 96,99 P3500, 99-00 Savana 3500; OLDSMOBILE: 94-95 88, 88-91,94-95 98, 96-98 Achieva, 99-01 Alero, 96-99 Cutlass, 89-91 Cutlass Calais/Cruiser, 89-91,96-96 Cutlass Ciera, 96-97 Cutlass Supreme Compatible with (continued): OLDSMOBILE: 88-91 Delta 88, 94-01 Silhouette, 88-91 Toronado; PONTIAC: 88-92,94-95 Bonneville, 80,96-97 Firebird, 96-01 Grand Am, 96-01 Grand Prix, 99-01 Montana, 94-99 Trans Sport