2003 Gmc sierra 1500 ext cab Read Also: 2003 Gmc sierra 1500 z71 specs 2003 Gmc sierra 1500 slt z71 2003 Gmc sierra 1500 mpg 2003 Gmc sierra 1500 parts 2003 Gmc sierra 1500 hd 2003 Gmc sierra 1500 bolt pattern