GM supercharger. Look at all pictures.  Actual pictures of the item.  Part #24504217.  Will fit the following models:Buick Park Avenue 1998-2005, Buick Regal 1998-2004, Pontiac Grand Prix 1998-2003. Part number is provided so that you may check with a dealer to insure that this is the correct application for your vehicle.   All items listed as "used" are sold in "as-is" condition.