This is a new old stock bevel gear and shaft part number JA-51883-7  it has 20 teeth ,key way and hole.Shaft is 4 7/8" long from gear  to end ,3/4" dia. 5 3/4" total length.
  This fits the 48" snow thrower box for the 59892 single stage blower.I also have a complete gear box avail for this blower