Removing and installing rear seat Lancer X

You need a "14" socket wrench

Removing and installing rear seat Lancer X

1. Overcoming the resistance of the latches, remove the rear seat cushion.

2. Remove the bolt securing the side support pad.

3. Lift it up and out of the vehicle.

4. Fold back the rear seat back, remove the bolt securing the left seat back bracket to the body.

5. Remove the bolts securing the seat back center bracket to the body.

6. Unscrew the bolt securing the right backrest bracket in the same way.

7. Lift the seat backs up and remove them from the vehicle.

8. Install the rear seat in the reverse order of removal.

Source:  Mitsubishi Lancer X Owner's Manual