There are no drill brackets for the front and the rear wheels. Above the add to cart button there is a drop down menu where you can select to add the no drill brackets on to the order.
Yes you can use the current 12" flaps on your truck. Here are two offset bracket options
Black: https://www.sharptruck.com/truck-hardware-gaa756634
Polished stainless: https://www.sharptruck.com/truck-hardware-gb756486