For the truck you will need:
Rear bracket - GB755566 - https://www.sharptruck.com/truck-hardware-custom-fit-mounting-brackets-gb755566
Rear flaps: GB2124DX - https://www.sharptruck.com/truck-hardware-gatorback-mud-flaps-duramax-21x24-dually-gb2124dx
Verified Answer
Admin answered on 9/11/2018