DB Electrical SDR0271 For Chevy 2.8 2.8L 3.5 3.5L Colorado (04,05,06) Trailblazer 4.2 4.2L(02,03,04,05)GMC 2.8L 3.5L 4.2L Canyon Envoy (02,03,04,05)Olds 4.2L Bravada (02-04)12563863, 12574145,12582277 100% New aftermarket unit built to meet OEM specifications 1-year warranty protects you after your purchase Factory direct pricing with no middleman markup delivers exceptional value