1967 k10 locking hub help

[67mater]

hello, I have some questions on the mismatched hubs that are on my 67 k10. It has the original closed knuckle dana 44 and two different styles of locking hubs. I've searched all over and dont exactly see what I am dealing wth.

First, the drivers side is a warn, but I cant find this style of Warn hub as it appears there is a missing trim ring of some kind, under which is a snap ring. Becuase of the ring, there are not the 6 bolt holes I see on others. So what am I missing and is it worth trying to find? this side seems to work smoothly otherwise.