It's on Ebay, with a $200 starting bid, no reserve:
eBay Motors: H&R Parts adjustable anti-swaybar system Grand National (item 150081016264 end time Jan-20-07 15:44:49 PST)
eBay Motors: H&R Parts adjustable anti-swaybar system Grand National (item 150081016264 end time Jan-20-07 15:44:49 PST)