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If the OD is ~.2" one "replacement" you might look for is the plunger seal off a syringe. They come in lots of diameters, and are available in various rubber compounds (I'd look for a nitrile like viton for the diesel application).

My experience with old hydraulics is that the rubber has to deteriorate pretty bad for a seal to take that much of a set. I wouldn't expect it to seal even if you cleaned up the end. What are the approximate dimensions ? That kind of rubber tip on the end of a piston or rod looks real...