Richard,

You can use JR servos with Futaba receiver. I have almost all JR servos in mine and Im flying with the 9Z. I do have a few futaba digitals in mine they are the 9252s on the bobcat ailerons. I know Futaba has a brochure out that has every servo they make in it along with all specs including dimensions, torque and gear type. I just picked mine up today from radiosouth. You might try and email them to get a copy.

Mike