Ye dealers usually ask you for your reg to look up your car, obviously if you are putting a sport grill on a non sport car you need to make that clear to them that you want the sport grill and not the standard one.
As for removing its really easy lift bonnet take the 2 plastic screw plugs out and slowly push each edge of the grill back towards the engine of the car left side then right then pop the middle out , it sounds harsh but it worked for me, found a post on here explaining how to do it, Then give it a wipe down on painwork then fit your new one, Less than a 5 min job