If either of the struts was leaking, I would replace both and have the rear shocks inspected. They are 21 years old now. The same goes for the rest of the rubber but it may be fine. I have been surprised by the longevity of the rubber on my brother's W116 300SD. If any of the bushings or ball joint/tie rod boots are split are starting to split, just replace it all.

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.