The only issue with cutting out any material from the brackets is the angle of them which is slightly complex; nothing is straight so when you cut something out, then it will result in things being too wide or narrow. I think the easiest method is cut the horns right behind here they bolt to the bumper, then make a new mounting tab and weld that back onto the bracket horn. Not sure I am explaining this well but I think I might have put pictures of how I did my rear brackets which illustrates better what I am saying.