Just come from ROK show in kendal at the search and rescue evening and found this being sold for sit-ons and kayak's looking at it it may fit with a little effort to a open boat. At 49.99 seems a lot for a fibreglass hoop and a peice of nylon or am I wrong.
http://www.bicboats.co.uk/Kayaks/Acc...Kayak-Sail/153