Hmmm.. The "Buy it Now" price comes up as $39.99 for me. No S&H specified.that one is $52.00 used. I hate to say it but you are better off buying a new one at www.cheapcycleparts.com there it's $62.00 for both pieces shipped.
After reading the OP again, it seems he only needs the back door assembly that is hinged.The rear flipdown cover assy 32098-1057 on OEM fiches. Anyone know of junk/salvage availability? Hate to pay for new plastic. Schooner.