Response on the subject from MB Classic Center:

The rubber mat is no longer available and it appears Mercedes has no plans on bringing it back I checked with Germany and they have none on order

Kind regards, / Mit freundlichen Grüßen,

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Currently:
1972 350SL Euro 4spd
1973 BMW R75/5
1981 BMW R80GS
1995 FZJ80 with OM606 Conversion In Progress