I will try to break it down.
This is the servo that came with my hyperdyne kit:
http://www2.towerhobbies.com/cgi-bi...1P?Q=1&I=LXN620
It would probably be your best choice.
I dont have a picture of my set up, but I will try to explain what I did. I took on of the servo "horns" that came with my servo, cut off the plastic "arms", and epoxied the center hub to the inside face of my RF stalk. (a servo "horn" is any one of the white plastic pieces in this picture. including the circle mounted to the servo.)

The center hub of the horn is held on to the servo by a small screw. The hub also has internal teeth that mesh with external teeth on the servo output shaft.
The transmitter and receiver both come with the zipzap car. The transmitter is the controller that you hold to drive the car. And the receiver is the circuit board in the car itself. The receiver circuit board in the car gets connected to the servo motor to control the RF.
Hope this helps.
Gator