Part for a Dualmatic C-250 hub
 

Shortly after my dad bought a new 61 K1000 Suburban, he installed a set of Dualmatic C-250 hubs. A few years ago he removed them because of leaks. I know there are easier options, but I’m trying to reinstall what I remember growing up. I’m missing the part for one side that replaces the outer spindle nut. Any ideas would be appreciated. Below are two views of the part and a picture of the outer part to help you remember what a C-250 was.