I see that they're now running the SC w/ 3wire std servos, and the receivers are std DSM2, so you're OK then. Just use a dab of hot glue to mount the servo.
I suggest that you apply a piece of tape to the side of the servo then apply the hot glue onto the tape surface. That will make it easier to remove the glue if you ever need to reuse it on something else.
Don't use too much glue. You don't what any excess to squeeze into the shaft/arm area causing a problem.