These are a perfect replacement or your 500 class helicopter The bearing measurements are 8mm x 16mm x 5mm
500 Class One Way Bearing 10x14x12
500 Class DFC Main Rotor Head Assembly
500 Class DFC Main Blade Grips / Holder
500 Class Metal Tail Holder & Rotor Assembly (Torque Tube Version)
500 Class Drive Gear Set
500 Class Plastic Tail Blade (76mm from bolt hole)
