I actually had sets of Solcat 18, Prindle 18 and Hobie 18 at the same time and put them on top of each other to see the difference. They are all about the same size as far as height, but the foot of the TheMightyHobie18 sail is much larger. You should be able to use any of them. There is a TheMightyHobie18 jib on eBay right now..