i just went to autozone got the alt, then bolted in the HD a/c bracket, bolted in the alt buy the top bolt, used a peice of construction paper on the bracket to trace the arch of the bottom hold down bolt, made a peice to follow the arch, cut and weld. you can buy the brackets already done from a couple vendors, i have a alt bracket if you want to try this at home, i like the HD bracket for this, had to also make the top bracket, i just traced the original and cut it out, but without the little offset like the original works great.