Double Iridium firing pin and ground electrode inlay provide 4X longer service life compared to standard copper plugs | 0.6mm fine wire firing pin provides superior ignitability and performance | 360 Degree continuous laser weld fuses corrosion resistant iridium firing pin to base for increased durability | 7 year performance satisfaction | Original equipment, pre-gapped replacement delivering optimum fit, form and function | Buick: 08-09 Allure, 08-09 LaCrosse, 04-07 Rainier; Cadillac: 04-07,09-15 CTS, 02-14 Escalade, 03-14 Escalade ESV, 02-13 Escalade EXT; Chevrolet: 07-13 Avalanche, 02-06 Avalanche 1500, 10-15 Camaro, 11-16 Caprice, 09-12 Colorado, 97-13 Corvette | Chevrolet: 03-14 Express 1500, 09-17 Express 4500, 06-09 Impala, 06-07 Monte Carlo, 00-13 Silverado 1500, 07 Silverado 1500 Classic,05-06 Silverado 1500 HD, 07 Silverado 1500 HD Classic, 00-04 Silverado 2500, 07 Silverado 2500 HD Classic | Chevroleyt: 01-06 Silverado 3500, 07 Silverado 3500 Classic, 07 Silverado 3500 HD, 14-17 SS, 03-06 SSR, 00-14 Suburban 1500, 00-13 Suburban 2500, 00-14 Tahoe, 06-09 Trailblazer, 03-06 Trailblazer EXT | GMC: 09-12 Canyon, 05-09 Envoy, 03-06 Envoy XL, 04-05 Envoy XUV, 03-14 Savana 1500, 09-16 Savana 4500, 00-13 Sierra 1500, 07 Sierra 1500 Classic,05-06 Sierra 1500 HD, 07 Sierra 1500 HD Classic, 00-04 Sierra 2500 | GMC: 07 Sierra 2500 HD Classic, 01-06 Sierra 3500, 00-14 Yukon, 00-14 Yukon XL 1500, 00-13 Yukon XL 2500, Hummer: 03-09 H2, 08-10 H3, 09-10 H3T; Isuzu: 03-06 Ascender; Saab: 05-09 9-7x