UK eBay may sell the Injector Nozzles you need.
The nozzles that are used in an 1985 300D with turbo are backwards compatible with the earlier models.
The whole injector is the same except for the pop-opening pressure is different between the turbo and the NA. It is just a matter of adjusting the spring shims to get the proper pressure and balance between the other nozzles.

However, there is 2 styles of Injector bodies with which the parts are not interchangeable. If you take an Injector apart keep all of the parts for one injector separated from the rest.

If you go back far enough the Injector bodies are different. On the older ones the fuel return from the injectors is connected to a Banjo that slides over the long threaded end of the Injector and there is a Nut that follows that an screws onto the Banjo. Most frequently all of the banjos are connected to each other by metal tubing.

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84 300D, 82 Volvo 244Gl Diesel