You can tell which suspension the car had when it left the factory by looking at the VIN plate at the bottom of the centre door pillar, passenger side. If you have the original shock absorbers, rear ones will be shot. Mine had 2 inches of free play in them at 100,000 miles...
Look at the list of codes along the bottom of the VIN plate and it tells you what the springs, dampers, anti-roll bar & brakes are fitted.