If you could be more specific on the parts that might be needed we could offer better advice, but basically bearings, seals and gaskets are readily available, as are most other bits either new or secondhand, it's all about time and money to bring them in and fit them.
regards
Mike
I am still have some used d4 parts
you must have quite a yard Gemdozer 👍 your source of parts seems endless and is a great help to many who are restoring machines :cool2: