Steering Gear Boot is a direct fit for the following:

1999-2007 Chevrolet Silverado 1500
2007 Chevrolet Silverado 1500 Classic
2001-2006 Chevrolet Silverado 1500 HD
2007 Chevrolet Silverado 1500 HD Classic
1999-2007 GMC Sierra 1500
2007 GMC Sierra 1500 Classic
2001-2006 GMC Sierra 1500 HD
2007 GMC Sierra 1500 HD Classic