G3X manual shows in the longest (position A) hole on the servo lever
pages 12-17 thru 12-37.
Can't remember which brand (Garmin, Dynon, Trig... I've installed them all) one of them stated that ideally the lever swing should be between 90 & 120 degrees. If you use one of the shorter lever length holes, you risk creating a larger arc swing which would be bad.