Fuel Pocket / Tank Filler Neck is a direct fit for the following:

2005-2007 Buick Rainier
2005 Chevrolet SSR
2005-2009 Chevrolet Trailblazer
2005-2006 Chevrolet Trailblazer EXT
2005-2009 GMC Envoy
2005-2006 GMC Envoy XL

Genuine Chevrolet Part Number: 15244046