Count the visible coils and make sure the springs look the same on both sides. If the left side one is broken, it will have "interlocked" coils. I had a Dodge do this once, bit PITA.
I don't think the rubber spring pad is easily visible, at least the top one as it is inside the cup on the body. You may need a small mirror to see if it is in place. Bottom one is easy to see on the spring link. I think the spring has a "free coil" on the end -- that is, it isn't "flattened" so that the end touches the coil underneath. The end of the spring should fit into a contoured pocket in the rubber pad -- if it doesn't, that side will be a bit higher.
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!