Difference in Manual hubs?

I went to a salvage yard the other day to get a new hub. They had one truck that seemed to be a 98-00 model. I couldn't really tell cause most of the body was gone. I went to pull the hub, and instead of a snap ring on the end of the cv, there was a brass 12m bolt and washer. I know the ADD cv's have the large bolt on the outer portion, but I'd never seen anything like this on a manual setup. I went ahead and took the hub since nothing really looked different on that end. Has anybody ran into this?