These are simply much thicker and robust than the thinner OEM and are slotted for setting the T-handle straight across as you can see in the picture. These could be a lifetime part, though it may take awhile to know this, one thing for sure it that they last a long time and at double the price of the lesser quality OEM parts, they are well worth it. These along with the Aricks T-handle are parts that we highly recommend once your OEM parts wear out. For John Deere 1890, 1895, 1990, 1590, 1690, and 1860 models. Replaces John Deere Part# N283120
The additional photos show covers and T-handles that are all from the same machine and have done the same amount of work.
Notice the visible differences in the wear on the OEM versions compared to the Aricks heavy duty version.