The new bushing is very thick; and it is a tight fit - so you might have to remove the shocks to press it in.

Besides the electrical connectors for the heating elements on the rear seats, you'd only need to remove the hydraulic lines in addition to other w126 models. Bleed the line before doing so to avoid hydraulic fluid jetting into your interior.

The part you're looking for is called "shock bump stop" in FastLane, FYI.

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'86 560SEL | Silver Ext. / Blue Int. | 201K miles (Apr. 05) | 204K miles (Feb. 06)