Remote Central Locking Fitting Audi A3 Fitting Remote Locking To An 1998 Audi A3 With Central Locking?

Fitting remote locking to an 1998 audi a3 with central locking? - remote central locking fitting audi a3

I'm looking for a remote locking kit for my Audi A3 1998th If you have central locking, so I'm not worried about engine assembly / magnet coils. I wonder how I can put the son into the car and what is the best place to order to enter the control box?