I know the Talon is out there, but it's not on their website? I don't understand this.
However, I have been using a Tectonics Tomcat 42 on my iS 111 for a few years and love the fin. I use it with my 8.4, 7.6 and 6.6 race sails. I weigh 77kg and free sail the board. The 42 is a little small for the 8.4 and a little large for the 6.6, but overall, a good one fin solution.