Questions for Truck Hardware Gatorback Black Wrap GMC Mud Flaps - Set

No that will not fit the 2012. If you go here, https://www.sharptruck.com/gatorback-gmc-logo-with-black-wrap-mud-flaps Put in your vehicles info and the site will show you the 3 part numbers you need for your truck

No, here is what you need, Front flaps: https://www.sharptruck.com/truck-hardware-gb1223cutg-full Rear flaps: https://www.sharptruck.com/truck-hardware-gb1223g-full Rear brackets: https://www.sharptruck.com/truck-hardware-custom-fit-mounting-brackets-gb756056