Rolled up my sleeves and took the plunge installing the earlier style (#1 in diagram) mount today,
two short trips later, seems to have worked! No more excessive clunking when turning, idle vibrations reduced.
Old mount was torn 2/3 of the way around, mostly towards the front of the vehicle.
I ...

Long time lurker, first time poster with the exact same problem
I am leaning towards volvoinneeds conclusion that the mount was changed in production, as it seems to occupy the same space as the video posted by MadeInJapan.
HOWEVER:
In my research all the parts suppliers list the mount posted in the ...