Most of the filter company sites I have seen have a search box where you can insert a another filter makers part number and it will give you the part number for their own filter. What that means is you can go to pelican parts and get the Mercedes number for the filter or if pelican is not selling the Mann filter a non-Mann filter number and plug either of those into the search box.

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84 300D, 82 Volvo 244Gl Diesel