Please check notes in each part listing to ensure the Spark Plug (Coil-On-Plug) Boot is correct for your 2008 CHEVROLET TRAILBLAZER with a 4.2L engine. STANDARD MOTOR PRODUCTS, ACDELCO, UNITED IGNITION WIRE, BOSCH, PRESTOLITE, & DENSO are competing brands, and each brand's Spark Plug (Coil-On-Plug) Boot may be interchangeable. Special restrictions like "California only" or "with sport package" may indicate a Spark Plug (Coil-On-Plug) Boot fits only certain 2008 CHEVROLET TRAILBLAZER models.
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