Are we all looking at the same thing?
Yep [USER=6421]@1K9[/USER] , yours is worn with that step, your original prop shaft must be similarly worn too or worse.
In my discussions with [USER=3630]@Mittzy[/USER] it seems the prop shaft male teeth tend to wear more quickly than the receiving diff on used examples he has seen.
[ATTACH]107756[/ATTACH]
That Aussie one on eBay
[ATTACH=full]107757[/ATTACH]
The 'Rim side' of diff look similar.
The one on Aussie eBay
[ATTACH=full]107759[/ATTACH]
Your one 1K9
[ATTACH]107769[/ATTACH]