Again we took some healthy lowers and build the mold to come out exactly as the originals where. After we pulled the first sets to our satisfaction, we looked at ways for improvements. Some of the folks that had been installing the original versions not made by us pointed out that they had been cracking where they attach to the frame mounts at the bottom. In trying to create the best product that we can, we decided to imbed 1/16 “ sheet metal into that weak area and layer it with the compositestrengthening this area against cracking in the future.