Kit to stretch the N556 to a 600 size.
1 each 556-034 34t Helical Tail Drive Gear
1 each 556-014 14t Motor Pinion
1 each 556-414 N556 Stretch Torque Tube
1 each 556-412 N556 Tail Boom Light
1 each 556-410 Tail Pushrod 595mm
You will also potentially need torque tube ends, pin retainers, 11mm pins Torque Tube Bearings, Bearing Holder and O-Rings. Also Pushrod ends.
Plus 600 size blades of course!