Photo 1 shows a couple module brackets mounted up in the same location on the new (old) pedal bracket assembly so things will line up with the wiring harness.
Photo 2 shows both pedals before the necessary cutting of the automatic transmission brake pedal down to the size of the manual brake pedal size the original 88 Suburban piece on top and the 80 manual piece on bottom.
Photo 3 shows another shot of the pedal pad area with the one removed from the vehicle, marked for cutting.