After reading of catastropic vacuum pump failures i went and looked at the one on my new to me 91 300d and found the # 603.530.01.65 printed on the cover.That does not match up with anything that i read.Stamped in the cover in small type is #X20607.15. Can anyone tell what type pump this is?
TIA Don

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97 E300D 157000 miles
87 300TD ?141k? miles