The Kahler Floyds are slightly different shaped... I think the Takeuchi TRS trem will work just fine on there, they are almost indentical in shape. Or, you can try to find another Kahler unit, although I don't know how readily available they are. As for the lock nut, I think it should be the same dimensionally as the Floyd or Schaller nut, but I don't know about screw hole locations... if it's top mount, you could always fill the holes and redrill. If it's rear mounted, well... same as the bridge, try and find a new nut.