Hi Andy, welcome.
You are not qualified to do this type of work unless you have a calibration bench (they run around $35,000.00 for a cheapie).
Individual parts are not sold on the retail market for any fuel injection pump/governor assembly for specific reasons.
If you are ambitious enough, and a qualified diesel mechanic with the appropriate training, you can replace the shaft seal by yourself but it is an involved process. Best to heed Tommy's advice.


