This is the original size copper injector washer / gasket used on 1991-1993 Dodge 5.9L Cummins engines with 7 mm injector tips. These gaskets measure 2.5 mm thick and get compressed to seal out combustion gases from the injector opening in the cylinder head.
Case part number 2856438
Cummins part number 3923261
Bosch part number 2430 105 042
Iveco part number 8094757
Sold individually.