Differential (rear) for Piaggio Porter 1.4D

Hi Can anyone help?
In need of a differential (rear) for my '51' plate Piaggio Porter 1.4D panel van. Have done many searches and finding it near impossible to find one.
Also need the thrust washers for it (don't know if I've got that right) and sun gears (again not sure of terms)). Not a mechanic so hope this makes sense.
Any dealers that can help at this stage/second hand or refurbished.
Any help would be most appreciated.

Many thanks.

I have a few diffs here from 1.3 models, not sure if they would do your job, but if you can check with you local dealer they might be able to shed some light on it for you.