My MB manual doesn't which P/S box went with which year and model. Is the only way to know by getting the part number from the box? I want to make sure I use the right procedure for getting air out of the lines after replacing the PO/S pump. Thanks.

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1987 300TD; 166,000 mi/267151 Km - had to make room for the dog
1973 220D; mileage ??????
1978 300D; 178,000