Third Brake Light is a direct fit for the following:

2007-2013 Chevrolet Silverado 1500
2007-2014 Chevrolet Silverado 2500 HD
2007-2012 Chevrolet Silverado 3500
2007-2014 Chevrolet Silverado 3500 HD
2007-2013 GMC Sierra 1500
2007-2014 GMC Sierra 2500 HD
2007-2014 GMC Sierra 3500 HD

Genuine GM Part Number: 25890530