The Harmony BTS Rudder Blade and Blade Housing is the replacement blade for all of the BTS rudder systems including both Wilderness Systems, Perception and Dagger Kayaks.
This is a great rudder housing and blade, and was easy to install on my Perception kayak.
I have an Ascend FS12T kayak which is not set up for a rudder system, at all. I used this rudder and a gudgeon (which I, unfortunately, had to purchase from a different site) to put one on for myself. This rudder comes with the pull strings already in place to pull the rudder out of the water or back into the water, that was nice. The flashing used to mount the directional pull strings is easy to use and basic, which I liked. The pivot pin seems to be an industry standard and is quite long enough to mount in the gudgeon. Overall, I think this is a great rudder. It does not turn the boat on a dime, but I am able to make my way around 90 degree canal intersections without ever having to break my paddling stride.