Sounds like you are talking about the master flex ring. It depends on your governor cage whether or not the ring existed in the first place. If you found pieces of it in the pump, then it likely needs one. If not, you might have a pump with the solid weight cage. Some reseal kits have the master flex ring and some don't. See the article below for more detailed information about this.
Thanks for the help.When I open my pump it was only left 1 small piece around 1 of the bushings so I rally don't know what it really looks like,the seal kit that I got don't have anything looking like that .
Roosa Master / Stanadyne Diesel Injection Pump seal kit 24370 for DB2 automotive
I did read here a post from Gastrap here is the post
There's a rubber ring that holds the governor basket onto its drive plate. It disintigrates and contaminates the pump. If it runs this way too long it will destroy the pins on the 2 steel parts. The replacement ring is of a better material & lasts longer.
I really don't know what to do here. Do you know where I can get this ring or the solid govenor cage
Very helpful that post on that ring,now I know that I need one