The factory joints had metal bushings. Most all (even MOOG) new production joints now use plastic in them. Yes I believe that bushing moves around in there. It wont move much on a new joint but is noticeable on one with miles. If there is no slop in it, run it.
Okay, why not? The worst that can happen is that if they fail, and I'll have to pop them out and replace them with aftermarket. Thanks for pushing me off the fence. My nards were starting to hurt.