It all makes sense now. I thought you had the later diff that drains through the bottom bolt on the casing. Going by your photos you have the earlier diff ( like Scoobs )
The fill hole may not need a washer as the level always sits below it.
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V70 D5 SE Geartronic 215bhp Saville Grey 2012MY
940 LPT Manual 1996
740 SE 1990
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