I have my new nozzles but thay did not come with copper washers where can i get them at cummins dealer?

 

im sure you can. Maybe even the dodge dealership

 

Is it necessary to change them?

 

well back in my younger days ( i talk like it was ages ago..) i changed out my injectors with jammer 4's. I didnt replace the washers. I just reused them. However, they all say to replace them. But on the 4 sets that i have done i havnt, and i havnt had any problems either.