I wonder how many of those are in the landfills. I have changed starters in several Chevys I have owned over the last 45 years. All of which were used when I bought them. None of the starters I changed had the bracket. It was always left off by whoever preceded me? It's an important item. All the extra cantilevered weight of a starter without the brace hanging there definitely affects its operation. If you do an experiment and compare the sound/operation of the starter with and without the bracket, there is a dramatic difference.