Servo:
https://www.associatedelectrics.com/reedy/parts/details/27119-ASC27119-reedy_rt1705a_digital_hv_aluminum_brushless_low-profile_servo/
Servo horn:
https://www.associatedelectrics.com/factoryteam/parts/details/1366-ASC1366-ft_aluminum_servo_horn_25t_15_5_mm/