for the front, I just cut some 2"x2" tubing about 1" long. put holes on top and bottom. for the bottom, I took a strap of .25" about 3 inches long and put 2 holes 2" apart and put it on the bottom mount and my bumper looks stock.
For the rear I did the same thing for the top of it. and bent the bottom of the sell bumper to match the angle of the frame(four door), and drilled self tapping bolts into the frame. Put the cover on, it looks like stock.
It is so easy.