direct-fit speaker system package bolts in to 2014+ GMC Sierra or Chevy Silverado crew cab trucks. Front 3-way component speakers: 8″ door woofer, dash mounted 3″ midrange + 1″ silk dome tweeter for optimum imaging/staging. Read: 6.5″ coaxial speakers. all factory speaker location mounting adapters included. vehicle specific wiring harness included. not compatible with Bose factory-equipped trucks. Model Number SPT-31GM.