I need some help from some of you bolt experts. I have a shear bolt that I sheared. I have been to auto parts places and hardware stores and they have not been able to help me. The auto parts places have grade eight (8) and above but nothing to help me. The head has three (3) marks and a triangle on it. What grade bolt do I have? Bobby Hart Hush Puppy Forge Griffin, GA OBG, AFC