This is the Bosch copper injector washer / gasket used on 1988-2002 Dodge 5.9L Cummins engines with 7 mm injector tips. These gaskets measure 1.5 mm thick and get compressed to seal out combustion gases from the injector opening in the cylinder head.
Bosch Number 2430105009 is superseded by this gasket number F00VC17503.
Cummins Number = 3920174
Ambac Number = GA770019
Sold individually.