If you need a back brace for your 8 3/4 shoot me a PM, I still have the one that I ordered for my 8 3/4 before I realized the housing was toast.
Just a couple of tricks to keeping the 8 3/4 alive:
1. No trans brake.
2. Make the car lite.
3. If you use Caltracs, BOX IN YOUR SPRING PERCHES....don't ask me how I know....