Looks like a dodgy diff.
Think mine is "about" 19,5mm across the bearing seats (not written the measurement down), the first, oversize one that i had was 19,8mm (i had this dimension written down in a PM, and was told it was probably one of the early oversize ones).
So over 20mm = probably a bad diff, it may be part of the first batch.
(and the gear diff should be a little wider, not that much tho!!)
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