I need a injection pump for a 1980 240D OM616. Car-part is listing an options of before or after engine serial # 121329 YET there are cars from 1976-1983 that turn up no matter which option is chosen.

Do all U.S. spec 240D's injection pumps interchange? (I am expecting them to, but would rather not find out the hard way that the answer is "NO")

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'83 240D
'85 300D
'86 300SDL
'88 300E