This replacement engine coolant thermostat housing is engineered to match the fit and durability of the stock thermostat housing on specified vehicles. It is designed to withstand extreme temperature changes to extend service life. This part is compatible with the following vehicles. Before purchasing, enter your vehicle trim in the garage tool to confirm fitment. [Buick Lucerne: 2006, 2007, 2008, 2009, 2010, 2011] - [Cadillac Allante: 1993] - [Cadillac DeVille: 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005] - [Cadillac DTS: 2006, 2007, 2008, 2009, 2010, 2011] - [Cadillac Eldorado: 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002] - [Cadillac Seville: 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004] - [Oldsmobile Aurora: 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003] - [Pontiac Bonneville: 2004, 2005]