1999-2002 Chevy Silverado and GMC Sierra regular cab
2003-2007 Chevrolet Silverado and GMC Sierra extended cab
2000 GMC Sierra 1500 - find speakers, stereos, and dash kits that fit your car
Front Door Speaker Replacement Package for 1999-2000 GMC Sierra Classic | NVX | eBay
GMC Sierra 1999-2006 Factory Speaker Replacement Harmony R65 R46 Package New - Walmart.com
Dual 6.5" (D6) Speaker Pods for 2000-2006 GMC Sierra - Custom Speaker Pods
Amazon.com: Compatible with Chevy Silverado or GMC Sierra Full Size Extended Cab Truck 1999-2006 Dual 10" Subwoofer Sub Box Speaker Enclosure : Electronics