Should have come with the car. Dealer isn't supposed to install it for street use. Supposed to be for track use only. If they lost it or didn't put it with the car then they should have to order you one. Might want to check the truck for it. I know the front splitter ships loose inside the car and the dealer has to install that and they are supposed to give you the separator and the install instructions with it.
2013 Victory Red 2SS/1LE W/RS/NPP
2002 Bright Rally Red Camaro SS 6-speed Manual