Spheres ( hydraulic accumulators ) control ride quality, these act as air springs giving the self leveling some compliance. These won't affect a car sitting low or leaning to one side like the one in question.

I'm not specifically looking for a W210 MB wagon but given it is a 4 matic car I'd be interested for sub $ 800 then using it as a salt car. ( The bank is asking $2,900 in an attempt to recover a bad loan, if this goes to auction it will bring nothing. ) There are some nicer cars in the $ 3,500 range but that misses the point of a low $ car that needs big $ in shop repairs but can be made to run for low $ through alternate methods.