There is Mercedes parts sellers that show the EPC page and on one side of the page there is numbers that say what chassis range where the parts are different. You could get the original part number from there.

Another way to go would be to go to a parts site that uses the VIN to determine what part is correct for your Car.

Get the part numbers from those sites and shop where you want to with that part number.

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84 300D, 82 Volvo 244Gl Diesel