We've had these made for us so that the top and bottom ratchet are the correct shape. Before, the top ratchet was incorrect, causing them to foul on the hub, leading them to need cutting to get them to fit.
Ours are slightly wider than original too. This gives better meshing between the teeth when under load. The teeth profile has also been improved to give smoother operation and better locking capability under load. They are also hardened (originals never were) so that they don’t wear.
