Alpine Electronics SPT-21GM Restyle 2-Way Speaker System for Full-Size Chevy, GMC Trucks or SUVs, Set of 8 2-way speaker system for Chevy or GMC trucks (2007-2013 Avalanche, Silverado, Sierra) or SUVs (2007-2014 Suburban, Tahoe, Yukon/XL) 6.5-inch component speakers for the front (6.5-inch woofers and 1-inch tweeters in specially-designed pods) and 6.5-inch coaxial speakers for the rear Speakers fit into factory speaker locations Mounting adapters included to optimize the position and angle of the speakers for the best possible sound reproduction The SPT-21GM is an Authorized Online Product Sold By and Shipped from Amazon; visit the store locator on the Alpine USA website for professional installation