Amazon.com: ShareGoo 2PCS Metal 25T Servo Horn M3 Threads Steering Arm Server Rocker Compatible with Futaba Savox Power HD HSP Servos Motor 1/8 1/10 RC Car Truck,Red : Toys & Games
DC1 Aluminum Servo Horn – R1 Brushless Motor Lab, LLC.
Savox SH11P - Plastic Micro Servo Horn Set, for Plastic Gear Servos, 21 Tooth – Savox USA
Thoor™ H2524 High-Clearance 25T Servo Horn
Standard Servo Arm and Horn Set - 25 Spline : ID 4250 : $2.50 : Adafruit Industries, Unique & fun DIY electronics and kits