Required on all 2001 to 2003 General Motors trucks. On 2004 models it is required if the eighth character in the VIN is a "1".Kit needed for GM trucks with LB7 engines, years 2001 to 2003 and some 2004.Freight on the LB7 Kit is free when ordered with a tank. If not ordered with the tank, a $70.00 over-night express (Fed Ex) freight charge will apply.