What kind of 18 are you looking for (vintage, etc)?
I was just window shopping yesterday I had one of the best sailing days no broken parts and I got the boat dailed in better the set up and boat balance is way more critical on the Nacra 5.5 but man it flys a hull and seems to balance really well on one hull!!
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Floyd
1990 Nacra 5.5sl = $$$ will work for parts.
10 Mile Surfside, TX
http://killeen.craigslist.org/boa/1860048442.html
This guy does too not sure if you can ship them
http://oklahomacity.craigslist.org/boa/1802441930.html
Good Luck!
Floyd
1990 Nacra 5.5sl = $$$ will work for parts.
10 Mile Surfside, TX