the Hitec HS-55 is a good fit but is slightly slower than the GWS NARO +F HP BB. The GWS servos may need to be mounted on small spacers as the servo mounting flanges are closer to the top of the servo. the GWS servos are slightly heavier but have double the torque. the Hitec servos are about $18 each and the GWS are about $17 each. Until I find something better I am going to get the GWS NARO +F HP BB. there are more choices out there but I don't know much about them.