80s bumper on a 70s?

[Nick_R_23]

I have an 86 cab on a 78 frame and I bolted my bumper directly to the frame by cutting the brackets exactly as shown in the picture. I believe I did have to drill an extra hole in on the frame that was present on the 86 but not the 78, but other than those two mods it was a bolt on deal - absolutely zero cutting on my frame.