Check the bushings on the spring plate(comes from the torsion tube down to the wheel) in the back. You could get by with just changing the outer one(the one under the cap on the end of the torsion tube) but that will only delay the inevitable as if the outer one is bad then both the inner and outer are bad. It is really not a hard fix with a jack some chain and a pry bar. Just make sure that you block up the car really well, mark everything so you can put it back together exactly as it came apart. disassemble the arm from the spring plate and pull the cap off the torsion tube. Using the jack and the chain jack the spring plate up off the stop then as you let it down use the bar to guide the spring plate over the stop. once it is down mark where it is at so you can put it back together correctly or your car will sit higher or lower on one side. Pull the spring plate out of the torsion tube(it will normally bring the torsion bar with it but not always) and then change the bushings. Also I would suggest that you change both sides and if you are going back with stock bushings use LOTS of talcum powder on the bushings or you will have an extremely annoying squeak.
66 Ghia 76 std Beetle
It's not a car it's a VolksWagon