Q-Power - QBGMC12 2014 4DR - 2hole 12" for GMC/Chevy 2014-2016 Crew Cab Underseat Downfire Finished with Durable Bed Liner 2014- Current GMC/Chevy Crew cab Does NOT fit Double Cab Air Space: 0.63 Cubic Feet (per sub) Mounting Depth: 4.5" - Chevy Speake