This is a genuine OEM part. The Ingersoll Rand reverse valve knob screw is compatible with the 231C 1/2" Drive Air Impact Wrench. The metal screw fastens the reverse valve knob onto the housing, and is sold individually. You will need a hex key for the repair.
The socket retainer fits between the ring and the pushing. This is made of metal and is available as an individual replacement part. It is a genuine item that is supplied by the original equipment manufacturer for use with Ingersoll Rand impact wrenches. A screwdriver may be helpful when replacing this part. It will need to be replaced if it becomes broken.