Originally Posted by Jeff Brown
I believe the Futaba servo will have a "flange" on the plug. Just cut it off and you are fine. No need for an adapter.
Check whether your servo has that flange on the plug.If no,then you're good to just plug it into your new reciver.Or not just shave it off.The flange has not signigicant use....Its just there as a fail safe mechanism,as some manufactures are afraid that you'll plug in the other way round and fry your electronics.
If you're having your new reciever,just check the polarity of the pins,whether it coinsides with your servo leads.