You do not drive a basic truck, so do not be satisfied with a basic, one-size-fits-all speaker system. Upgrade your trucks speakers with the SPT-31GM. The SPT-31GM is Alpine engineered and sound matched to fit into the specified Chevy Silverado and GMC Sierra models. This 240-wattsound system consists of 8-inch woofers (for the front doors), 6.5-inch coaxial speakers (for the rear doors) and 3-inch midrange speakers with 1-inch silk dome tweeters (mounted in housings that are installed in the dash). The speakers and tweeters fit into the factory locations and use the factory connectors for incredible imaging and staging in your truck. All needed installation hardware like amplifier wiring and speaker adapters are included (some vehicles may require custom tweeter installation).