Single Sub Box 2001-2006 SILVERADO HD CREW CAB Xtreme Enclosures $160.65 Fits 2001 to 2006 Chevrolet Silverado / GMC Sierra Crew Heavy Duty truck; 1500 HD, 2500 HD and 3500 HD NOTE: Does not fit the Half-ton crew. We have another box available for the half ton crew cab truck. FEATURES: Fits one 8 inch or 10 inch subwoofer... Choose Options