The link to the upper a arm center bushing which is the problem piece in the design:
SuperPro SPF3669K Superpro SPF3669K Made by SuperPro
It is a special order piece with 6-8 wks delivery time. I think it comes from Australia.
The thread is here:
Rear upper A arm bushings
Gotta get this stuff in a sticky in the suspension section.
I am figuring I would have about $600 in the front arms, rear lower and bushings to rebuild the rear upper a arm. I have already replace the factory shocks with Bilsteins which have improved the handling too. Another $300 or so for UC springs and isolators. Probably $1k to get things fully rebuilt and better than factory.