I have the Partik AIO with carbon deep tuttle mast which I believe is the same as the Simmer Blackbird as Zeeko is the ODM for both, and I have also had the Starboard race foil kit and used both with a variety of boards. The Patrik deep tuttle mast seems a little bit shallower than the starboard and works well in my Severne Alien 125. I don't have direct experience with the starboard foil x, but know someone that was using one with a Severne redwing foil, so my guess is that they should be ok but always best to try it first.