I have a similar set ,but in black.the bottom bolt holes on these attach where the motor mount stud is.You have to remove the nuts,mount crashbar,than reinstall nuts (on both sides ).The top part of the crashbar where their are U bolts attached, bolt right on to the frame.I have had problems with the U bolts constantly breaking on mine.Then I went to hardened universal joint ,U bolts from a car.No more bolt breakage.Now they break at the welds on the crash bars themselves.Had them rewelded at least three times, on each side.Finaly took them off.Can't for the life of me figure out why they do this.Eggsesive frame vibration perhaps?Bike runs silky smooth though.