OEM Used ECM for a 2005 Buick Park Avenue.  Will work on other Buicks, so check fitment.  Comes with gaskets.  This unit WILL NEED to be programmed to your vehicle before it will work, so keep that in mind.  You may need to take the car to a dealer or mechanic to have the programming done.  I will combiner shipping.  Email with questions and thanks for looking.