Read the info above. You will need to remove some of the parts inside the car. The pedal end has a ring on it so it slides in from the pedal end into a tube in the tunnel. Pull back the carpet under the heater and remove the metal cover plate at the front of the tunnel, depending where your existing one has broken you may be able to tape the new one to part of the old one and pull it through(you will need to remove the ring first.
It basically goes through a tube mounted in the floor/ tunnel. You can just replace the inner section only though and dont need to replace the rear outer sleeve.