I bought this strut for my 2006 Cadillac STS.  I cannot use it because i bought the wrong strut.  This strut is for AWD and my car is RWD.  It will fit all STS 2006-2011 that have AWD and Magnetic Ride.  Please be sure that your car has these features before making the purchase.  It was originally purchased on Ebay and is still new i only opened the box and then as i attempted to install it on my car realized i bough the wrong one.  This will fit either the right or left side of the car and V8 or V6.