Once the war was over, would they still have been in use ?
There are quite lengthy docs on the reparations extracted after the war. ?
Not that I have perused them.
Have you seen one in the metal ?
There is nothing cast-in or stamped on them to identify the source/maker ?
Have you gone to Bosch and asked them ?
You may be better placed to try this.
Somewhere/sometime there would have been drawings and blueprints and patterns.
Quite a while back now though ...
There is quite a lot of info about about the Australian built engines by the Aust Navy in Randwick.
Including that Marconi tried, for some time, to sue over them, for blatant patent infringement.
Which was blocked by the Government, it seems.
