The correct model # is B50PD. D signifies diesel. It was made by Linde.

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Well, I think you need some info concerning the engine sealing and eventually some peripheral seals.
First, you must identify the engine serial No. Its usually stamped on the housing flange.
Second, if you share your mail address, I may be able to help you with identification of the parts.

I pulled the engine to replace the input seal going into the drive unit. while it is out I'm going to change front and rear main seals, valve cover seals, and flywheel starter teeth.

Hi
This looks like an old Linde 351 series from 1988 year.
Try with Linde parts. I don't know about the parts suppliers in your area, but TVH should have them all. What parts you need? I may be able to extract to pdf some catalogue pages from my software.