I have a stock SVT rear bar you can have for shipping. It's flat, so I can wrap it in a sheet of cardboard and slap a label on it. It's very clean, looks new, not a spec of corrosion, and I might have the body mounts and bushings if I paw around in some boxes.I might have some PRT endlinks too, they're yours if I find them.
The stab bar mounts on the rear subframe are subject to fracture and tearing off, and if the subframe has any corrosion, it just happens faster. A larger aftermarket bar will just accelerate the fracture and tearing process, so make sure your rear subframe and bar mounts are in good shape.