Ill check on those servos for you tonight to see if they will fit the slots and let you know.
I know the manual says that you need to use servos that are less than 9g, and have a speed of 60 degrees in .12sec or less
I went with the E-flite S75 servos, which fit perfectly in the slots and meet or exceed those specs, plus they are cheap. $13.99 per servo.

Im trying to figure out which motor to use too. And the helimax website doesnt have any info on them.