03-01991 now points to 115109. Match the equipment model, revision, serial range, voltage, and connector.

• The official F568 parts list maps current part 115109 from prior number 03-01991 to the 3/8-inch internal-tooth zinc-plated lock washer.
• Confirm nominal size, tooth form, material, finish, and mating switch bushing.
• Confirm panel stack and current speed-control hardware before ordering.