Here's what I think is the Hall upper rear brace (or certainly very similar). The PPC one is again similar but has a round upper bar. Reputedly the square bar that butts right up against where the shock mounts the other side is a better idea as it forces against that and does not just rely on the holes the bolts pass through to hold it solid.
The Hall square camber bar is $99 and then it's another $199 for the lower section to make it all up. I think it works out cheaper per piece if you buy the complete rigidity system i.e. all four braces. I thought PPC were only selling the kit complete anyway, it used to be around the $1,000 mark.
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