I always go to the kit maker/vendor to get those specs unless I know someone who has the same plane I am building or has more experience than I do.

Tower Hobbies lists several servos that can be used with this plane.

Check out http://www3.towerhobbies.com/cgi-bin...0p?&I=GPMA1044
This is the accessories list for the plane you're building.

Good luck