Block Heater is a direct fit for the following:

2002-2005 Cadillac Escalade
2002-2005 Chevrolet Avalanche
2006-2016 Chevrolet Express
2001-2016 Chevrolet Silverado
2001-2005 Chevrolet Suburban
2006-2016 GMC Savana
2001-2016 GMC Sierra
2001-2005 GMC Yukon

Genuine GM Part Number: 12657629