Trying to replace front sway bar end links, but the nut turns the link shaft.  There's no head on the other end, just four plastic "dots."  Suggestions are appreciated, thanks.

Its a ball joint stud link. There will either be a hex or torx head on the end of the stud which you hold with a socket while loosening the nut with a wrench.

Or there will be flats on the stud between the rubber dust boot and the sway bar or bracket which allow you to hold the stud with a wench.

Needle nose vice grips also work.