There aren't many pictures of the 707 plate up online, let alone comparison pics for volvos...until now. The 850R pressure plate was modified by Southbend Clutch and is double banded and has a few welds, nothing else that can be seen from the outside though.
Here goes.
Much beefier body than the Volvo plate
The disc sits right on the edge of the recess
707 has a larger burn path
