Hello Superstar:

Yes they are. Just put the angled corner where the tab on Futaba's would go. The arms are not interchangable. Although I believe Hitec can be forced on futaba servo's. I am not real sure on that. You can go the other way by cutting off the tab on Futaba servos. Anyway go ahead and use the Hitec servo's on your futaba equipment and don't worry, be happy (LOL).

Mark Shuman