I am assuming you mean the plow frame itself, as the head gear is what the lights, and lift piston attach to.
It will bolt on, but you might have to do a bit of trimming to the plow frame around the bump stops, and were the brake like comes throughthe frame and connects to the flex line. I think they are in a shade different place between 80, and 81. I have put plow frames from mid 70's trucks on 81 and up trucks and had to trim them a bit.