Without arguing about whether they are shocks, struts, or correctly, legs, the problem on my coupe turned out to be the balls ("rubber buffers" in the parts book) that cushion the legs where they mount to the frame/trunk. They screw on the top of the leg and have another threaded piece for the nut in the trunk.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe