Fuel Delivery Valve Leak - Where to get parts?

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Hi all,

I have a small Diesel leak at one of my fuel delivery valves on the 82 300D Turbo. It appears to be leaking up through the threads of the delivery valve. I would like to at the very least replace the crush washer that sits in the bottom of that hole, but I can't find it on any of the parts sites. I actually wouldn't be against replacing the other parts of the delivery valve as well, but I would settle for the crush washer.

The dealer has no clue what part or part number I need.

Does anyone know where I can find these crush washers for the Delivery valve on my 82 300D Turbo?

Thanks.