Hi, I would like to do some mod my car to change it from just central locking to double locking and more importantly remote locking. I am just a little confused, I'm currently looking at a part number 1S7T 15K600 [color="#0000FF"]KB[/color] but mine is 1S7T 15K600 [color="#FF0000"]BB[/color] (note the difference with the last two characters in each part number). My question is does every character in part number have to match perfectly? And would I have to carry out any other major changes with like the ECU and stuff?

looking forward to any good response.