Compatible with 2011–2013 Optima and Sonata equipped with the 2.4L 2359CC L4 DOHC engine (G4KJ engine model).Direct replacement for.Includes 4 engine pistons, 4 piston pins, 4 connecting rods, and 1 set of engine piston rings.Part numbers supported: 23040-2G200, 23040-25200, 23510-2G500, 23510-2GGA0, 23040-2G500, 23410-2G500, 23040-2G510, 23040 2G510, 23410 2G501, 234102G501, 23510-2G540, 23510-2G520.Installation requires no modification.For fit confirmation, provide your VIN number.