If you have a push button catch on your toilet door then you should be able to screw a replacement knob on the inside to allow the door to be opened from the inside, our part 130172. The actual lock that this fits to is our part 130180. From this lock, a rod is connected, our part 141091, which includes the hook that operates at the top and bottom of the door. The sleeving that covers the steel rod is our part 141090. There are normally two guides for the rods, our part 149635 and if you need the metal plates that fit top and bottom to accept the hooks then these are part 148158.