Aren’t the Duramax (left) and 5.9L Cummins common-rail (right) injectors from Bosch similar looking?...

 

The solenoids and upper bodies of the injectors are the same. The returns appear to be the same, too (the returns are known to leak at times in both applications). Of course, the bottom of the injector bodies are different (the Cummins unit is thicker). I compared the two while at Maximum Diesels yesterday afternoon. The crew there is in the middle of a couple injector failure projects—one with an LB7 Duramax, the other a common-rail 5.9L Cummins.

Both had injector failures. The failure in the Cummins caused heavy piston damage (LOOK HERE, it's on the right).