Yes, any of the 2018 options will work on the classic. You will just need to know if you have OEM fender flares or not,
Set for truck with flares: https://www.sharptruck.com/truck-hardware-gatorback-mud-flaps-gcr31f-bk-gcr33r-bk
Set for truck without OEM Flares: https://www.sharptruck.com/truck-hardware-gatorback-mud-flaps-gcr32f-bk-gcr33r-bk