I have roughly ( haven't measured yet) 4 inches on each side to fill because the 3/4 ton frame is narrower at the back than the 1/2 ton.

If I draw the brackets to the frame, the bumper is going to look a bit odd. LOL

I think I may be able to use a piece of C perlin to make a filler and bolt it to the frame, then bolt the bumper to the perlin.