In this thread you can partly see the Fuel Supply Pump number Plate (part of which is like the model number of the Fuel Supply Pump; look like FP/K 22 WW 22) and you can see the part number on the Handle of the New Bosch Replacement pump.
If your Fuel Supply Pump has the same Model number on the number plate the same New Bosch Hand Primer used in the Thread should work on yours.
http://www.peachparts.com/shopforum/diesel-discussion/

If your Fuel Supply Pump has a different model number on the Number Plate right it down and call some Bosch authorized Fuel Injection shops and see if you can find out what the correct part number of hand primer is for your Fuel Supply Pump number.

While doing an internet parts search for an 85 300TD (TD= Station Wagon) one of the companies said the Threads on the Diesel Primer Pump were 16mm. I referanced their part numbers to the same year 300D and the D and the TD used the same Hand Primer.
Unfortunatly they did not give the Bosch part number.

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84 300D, 82 Volvo 244Gl Diesel