Highwood does not have the rear flex disc for late USA cars. He has the rear disc for the late Euro cars. They are not the same.
If anyone needs a rear flex disc for the late Euro cars, I bought one to see if it could be made to work. Not without
a lot of work.
And fitting a GTV6 driveshaft is not feasible. The diameter of the yokes are larger on the GTV6. Front and back.