Replace them.
It can be very dangerous especially at high speeds in a curve. It causes the rear of the car to become very unstable.
Handling the vehicle especially on corners will be poor.
The links go on the end on the sway bar and hook to the suspension. Bushings are used to connect the sway bar to cars frame.
there should be a rear sway bar
sway bar
A sway bar is a torsion bar mounted laterally on a suspension and is designed to reduce side sway. The sway bar attempts to accomplish this by transferring movement from one side of the suspension to the other. This is done through the connection of a torsion bar to each side of an axle by flexible links. (Sway bar links)
A little more information. Year/model. Some sway bar links become loose because of wear and the links continue to work but make a noise when the front end hits a bump. Other sway bar links will break altogether and the vehicle will lean excessivly when going around a corner.
The sway bar is not adjustable, but you can replace the bushings.
A bad sway bar will cause vehicles to shift from side to side more easily when turning. The sway bar provides stability and limits motion.
sway bar end linksway bar end link
Broken sway bar or sway bar links.