This is for a complete set of new painted window scoops for your 2010-2012 Ford Mustang. This item requires no prep work at all as they come pre-painted and ready to install. They are made of the best ABS which means that they will not crack or distort in the heat or the cold and most of all will not rust. They attach to your vehicle with the supplied and already installed OE 3M adhesive, these window scoops adhere to your cars rear quarter window glass and not the actual car itself and will not rub on the body. This is for a set of DG Custom painted window scoops. With all custom painted products please allow up to 10 business days for orders to ship that are not in stock. Please confirm your color code to ensure you are purchasing the correct color.