Attributes . 1999 to 2004 Chevy Silverado 2500 Standard Cab, 1999 to 2007 Chevy Silverado 1500 Standard Cab, 1999 to 2007 GMC Sierra 1500 Extended Cab, 2001 to 2004 GMC Sierra 2500 Standard Cab, 2001 to 2006 Chevy Silverado 2500 HD Standard Cab, 2001 to 2006 Chevy Silverado 3500 Standard Cab, 2001 to 2006 GMC Sierra 2500 HD Standard Cab, 2001 to 2006 GMC Sierra 3500 Standard Cab, 2007 GMC Sierra 2500 HD Classic Standard Cab, 2007 GMC Sierra 3500 Classic Standard Cab . Names