Tekno TKR 5253 Aluminium servo horn - 25t spline - Futaba or Savox (SCT410 EB48.2 NB48 ET48 or NT48)
The Tekno RC Aluminum Servo Horns were designed to minimize forces transmitted back to the servo spline. It utilizes a bottom mount design that, as opposed to a top mount, lowers the leverage point. This means your servos will be protected better to keep you in the race. A locking screw is included for added security. Use M3x14mm flathead screw for mounting the steering linkage. Use thread locking compound on all metal-to-metal connections.
These were designed specifically for the Tekno RC line of vehicles, but they can be used in most other applications as well.