Turn Signal Light is a direct fit for the following:

2001-2007 GMC Sierra 1500
2007 GMC Sierra 1500 Classic
2001-2003, 2005-2006 GMC Sierra 1500 HD
2007 GMC Sierra 1500 HD Classic
2001-2004 GMC Sierra 2500
2001-2007 GMC Sierra 2500 HD
2007 GMC Sierra 2500 HD Classic
2001-2006 GMC Sierra 3500
2007 GMC Sierra 3500 Classic
2007 GMC Sierra 3500 HD
2001-2006 GMC Yukon
2001-2006 GMC Yukon XL 1500

Genuine GM Part Number: 15199555