Hi, the part you are looking at, part # AE5Z5E212H, fits a Federal spec 2012 Ford Fusion with the 3.0L engine. Your vehicle has 3 catalytic converters. This part number is the "upper rear". Your vehicle also uses 3 oxygen sensors. You can find the correct O2 sensors at this link: https://www.carid.com/2012-ford-fusion-oxygen-sensors/