I'd say $100, that seems to be the going price for the wing I want. I believe that's about half of what the Cayman style is new.
Unfortunately, the only RFG wing on ebay is in terrible condition.
Here are some photos
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'97 - Silver (rebuilt/stripping)
'99 - Black (rebuilt/sold)
'01 S - Rainforest Green (daily)
'03 S - Orient Red (sold)