Hi, I have an Aveo 2009 hatchback. I have a factory central lock. I bought this from amazon ( https://www.amazon.fr/gp/product/B01...?ie=UTF8&psc=1 ) . I want to install this but I don't know how. Do I have to buy this item too ? (https://www.google.com/search?q=si%C...WTIpJodgqlodM: ) In the pictures you can see what my driver's door looks.