Autopilot Servos

I’m currently building a Ran’s S21 Outbound. I’m planning on using the complete Flight View system for my airplane. I am trying to figure out what servos I should use for the Autopilot.
Any help would be greatly appreciated. Thanks for your time.

Eric

Also what Autopilot works with this system? It was late night here in Texas when i posted the above question.
Thanks again for the advice!

Eric