you dont need to get the whole pedal box (i.e. steering column holder thingy), just the pin (large bolt) the pedals rotate on, the bushes and the pedals themself and it will replace the old one, your lucky having auto as you will have the larger transmission tunnel

{edit} you also need the metal bracket on the engine side of the firewall that the clutch goes through and to cut this hole in your firewall

that is all pressuming the 1200 pedals are suited to a ca18det conversion