Radiator Cap is a direct fit for the following:

2006-2011 Chevrolet Impala
2006-2007 Chevrolet Monte Carlo
2006-2007 Chevrolet Uplander
2006 Pontiac Montana
2006-2007 Saturn Relay
2006-2007 Buick Terraza
2008-2009 Buick Lacrosse

Genuine GM Part Number: 15293434