The rubber portion is covered by a lifetime warranty. If you send a pic to [email protected] i can get a warranty claim started. The stainless plate can be transferred if it is not damaged.
if you need a plate those can be purchased individually here, https://www.sharptruck.com/truck-hardware-gatorback-ford-replacement-plate
The flaps need to be mounted to brackets, with the slots they will install on the custom fit no drill mounting brackets right out of the box. You will not have to put the slots in yourself
Yes, these flaps are for a dually. You would need an install bracket. The part number would depend on the year Super Duty. You can see the custom fit brackets here, https://www.sharptruck.com/truck-hardware-custom-fit-mud-flap-brackets