What? A Cast Iron Center Bearing Support? Cast Iron Center Case Divider? What is the actual term? Go figure it out! Of course it ain't original. Why use it? Most Factory Aluminum Pieces are damaged by incorrect installation. Most Aluminum Center Supports do not "Grip" the Bearing Shell tightly. Who cares? I do. I even care so much I grind the casting flash off so it looks original. Does this matter? Of course, it makes your eyes not hurt from seeing a different piece of metal!