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From The Saab Tech Wiki
Replacing the rear suspension, both the springs and dampers, is an easy job which shouldn't take long. This is only one way of doing it.
* When replacing the springs, put the spring in place and slowly lift the axle with the jack. Be careful to make sure the spring is placed as it should when lifting the axle in place.
* The rest is put back together in the opposite order.
If you for some reason only want to replace one of the springs, you could do this by following the list above for only one side of the car. Instead of putting the floor jack under the axle, put it under the rear wishbone, and lower it carefully.
