Now I see why you wanted the Aura style nut.Ok I can see why you don't see it.
Here is one of the nuts I pulled off my G250HP, it is the same nut on my S560.
View attachment 666272
It isn't an issue with the G250HP as the smooth side is facing out.
The nut I sent was meant for the G250, and I guess it works on the HP.
Crazy that the S560 has the same part number used on the G250 and it doesn’t work, yet the HP has a different part number and it works.