From your number plate description I deduce you are in the UK.

Have you tried an official  Merc dealer.  They do sell parts only.

Strange as it may seem they might even do a repair at a competitive price.

If you are anywhere near west London I would suggest Merc Park Royal.  They
have given me good service over the years (one of my cars is 2001, the other
1993, for which I have also used an independent but return to Merc for
certain things...)

Do phone first about part availability (and price).  Otherwise try a
breaker's yard, maybe via Google.

DAS

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