I've got one if you want it!
I have a Helwig rear anti-sway bar off my 92 that is just sitting in my barn. I would have to check to see if I still have the hardware. It looks almost new. It is rather unwieldy and heavy (as you can imagine) so packaging and shipping might be a challenge. You can have it if you compensate me for my packaging and shipping costs. Better-yet, if you're in SE Pa. come and get it.
Steve