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The stock direct drive support bracket went out of production a few years ago. Only available used now.
The reduction drive starter motor bracket is still available new.
I always thought the knurling was there because that is the part that is supposed to be in contact with the aluminum starter motor nose. Being a US made part 35 years ago, tolerances were not exactly all that tight in the design and even looser in practice.
Plus, there is the support bracket...