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Diff output shaft seals, *Pair*

Mini leylands ran a bell housing type inner C.V. joint called a pot joint. This is a pair of seals to replace the old seals that stop the oil from leaking directly from the diff area to the outside ground. The seals go inside the diff side plates.

Stop that leak (so your partner doesnt give you stick about the mess in the driveway :-) )

Normally if one is leaking then the other is about to.