For Chevrolet Silverado 1500 / GMC Sierra 2007-2014 Extended Cab ONLYSpeakers + Adapters for Rear/front LocationJBL Stage2634 (2 Pairs)6-1/2" 3-way speakers (pair)PEI balanced dome tweetergrilles includedhandles up to 40 watts RMS (250 watts peak power)impedance: 4 ohmsfrequency response: 55Hz - 20kHzsensitivity: 91 dBtop-mount depth: 2-1/4Chevrolet (extended cab, rear door)Silverado 2500/3500 2014Silverado 2008-2013Silverado (new body) 2007GMC (extended cab, rear door)Sierra 2500/3500 2014Sierra 2008-2013Sierra (new body) 2007AI GMSB356 Speaker Adapter Brackets