Rear Swaybar 21mm (MK4 2-point adjustable for AWD models): This part directly replaces the stock bar and utilizes factory mounting hardware. Bushings are supplied with integrated Teflon compound. They are self-lubricated to prevent squeaks. So, there's no mess, no maintenance, and a perfect fit.
Adjusting stiffness involves changing swaybar end link attachment position. Using the inner most holes provides the maxiumum rate (more resistant to body roll) while the outer most holes are softer (but still far stiffer than stock).