There are a few parts for W114/115s that I know for a fact are no longer available. The differential mount bushing for the pre-1973 cars is absolutely no longer available. I found one in New Zealand after searching for a week and calling numeround MB dealerships, calling friends who have a talent for finding these things and beginning to call independent mechanics. That bushing is on the way right now.

There are other parts that are no available from MB so perhaps the guy is being hyperbolic.

If I were going to spend that much money on my car, I'd bring it to Mercedes themselves and have them rebuild it and factory certify it in their pre-owned program. Then it would be essentially brand new and come with a warranty as well as a bunch of perks and the super cool "I just got a brand new 1972 220D from Mercedes-Benz" factor.

Phil Forrest

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1972 220D "Trudy," named by a friend.

"The 220D sounds good... I suspect it is the only car that you need a calendar for, rather than a stopwatch, when doing acceleration tests."
Tom Abrahamsson