Dealer item only new, and I'm not sure what you'll dig up on that. You may get lucky locating it, but it will be spendy. I know my bent strut rod was dealer only new, and roughly $125.00 after taxes.
Could just need bushings if you're having a bit of play in the rear. If it was never winter driven, I can't see how they'd be rotted out. It takes 20+ years in crap weather to rot those things. If you want to do them up right, pull them, blast them and powder coat, or POR-15 and AG111 coat them. Even if you powder coat, I'd suggest a good healthy inside coating of POR-15 anyway.