Taipan 4.9 sails are grommet to grommet, the same. Many of the Taipan folks went to the new bigger square top so there may be some used ones of the old design. You have to make adjustments for the boom; Either add a boom or have a batten pocket added. The jib works, too, except that the jib block attachment point must be changed. An F16 spinnaker would be a great addition to the Nacra 5.0 since it has spreaders and can stand the load. I'm working on a Nacra 5.0 rebuild and will have photos soon.