These special springs are unique to wagons only. They are designed to only support the weight of the car when it is unloaded. With age and malfunction hydraulic struts these springs can weaken and allow the rear of the vehicle to sag. NOTE: Before replacing springs you should first check the condition of the rubber center rear end mount which is the no. 1 cause of rear-end sag.
Rubber spacers are installed on the top of these springs and come in three different thicknesses. Having the correct spacer can also help in setting proper ride height.