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I was attempting to change diff fluid and noticed it needed a washer on the fill plug.

Would anyone know the crush washer size needed?

Does the drain plug need a crush washer as well? I didn't see one there from what I can tell.
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Looks like the front diff - the drain bolt in the circumference effectively uses the (housing) gasket as a seal so I don't think it has a separate gasket.

The fill plug there I think is 18mm like the rear diff. You CAN re-use that copper one if you are in a hurry and don't want to take a drive or wait on mail. Heat it red hot then let it cool - slow or quench does not matter. Then you can re-use it and it will crush again and seal.
 
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