This kit is intended to service part# IAG-ENG-5900 or part# IAG-ENG-5901 which fits the 2002-07 Subaru WRX, and 2004-07 STI. Includes: (x2) Copper Washer (x2) Seal PDF Instructions - PN# IAG-ENG-5900 for 2002-07 WRX & 2004-07 STI PDF Instructions - PN# IAG-ENG-5901 for 2002-07 WRX & 2004-07 STI.