Subsequent installation in Toyota Auris possible?

Hey people, here: http://www.toyota.de/cars/new_cars/auris/accessories.aspx you can see some offers that Toyota shows for the Auris as “additional equipment”.The question would be, can you retrofit these things too? I would be particularly interested in: – Seat heating – Stand heating – Park sensors (front and rear) – Xenon light Do you know if this is still possible afterwards, or are these things only possible in the context of a new car configuration?