I would take it to a service facility that knows these cars. Often for an hour's worth of labor or less they can tell you what is wrong and what is needed to be repaired. It would be unusual but not improbable for both sides of the suspension to have been damaged.
Let them look and see. It might not be as bad as it first appears. These cars are known for having rear springs that sag over the years and the rear suspension sub frame mounts wear out. If you need specific pieces, you could always get these pieces from a wrecking yard.
It is very hard to diagnosis without knowing exactly what is wrong.
both sides are angled in too much on the bottom and front