The star is an inverted torx you are supposed to use to keep the stud from spinning. The stud is kinda of a pain in the butt if its not still attached to the truck or the swaybar. If you already broke one, I would say a sawzall or a torch is in order.
A torch and some patience will be your best friend if you are trying to save the other link. Otherwise, pry pull, heat, bend, knaw and chew to get the other one off.
Rob L. :cheers: