OEM Subaru EJ motor crank pulley sprocket, which incorporates the tone wheel for the crank position sensor.
Does NOT fit 2015+ WRX, since that has an FA motor.
Note that this sprocket is intended for US ECUs. This sprocket will not work with early (pre-2006 or so) Japanese ECUs. Conversely, you can get some JDM blocks to work with a USDM ECU by swapping on this crank pulley sprocket.
Some surface corrosion (as shown in the photos) is common to see on these, even fresh from the factory. It will not affect the operation or structural integrity of the part.
Fits all 2002-2014 EJ-motor Subaru cars, including Impreza, WRX/STI, Legacy, and Forester. Also fits 2015-2021 WRX STI.