It is not the alumminum bushing that is worn, but the plastic insert holding it. You can't repair it to my knowledge.
We sell the whole shock or damper in the partsshop.

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Benzmac:
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM