4Pcs Aluminum Fuel Injector Insert Cup Seat For VW Polo 9N Golf 1J 06B133555H
For VW Golf 1J 2003-2006. For VW Polo 9N 2005 - 2010. These are Billet aluminum inserts that are screwed into the injector opening on the fuel rail. They hold the injector in the correct position in the fuel rail for a proper spray.