What is notable is a Gr8 will snap before a Gr5, those will distort first then break. Would step up to Flanged Head Frame Bolts and Nuts(Fine Thread), Increase Diameter from what appears a 5/8"? to a full 3/4"., if were only 1/2" then go to 5/8", build a stouter bracket for the bumper more like a Crossmember then can REALLY tear some Sh!t up!!