Convert your X3 Shaft version to X3 Belt version
208332-Tail Push Rod (2x 605 mm)
208914-X5 Tail Gear Case Set OR 208386-X5 CNC Integrated Tail Gear Case(Black anodized & belt version)
208911-X5 Tail Rotor Bel 572XL
208323-Tail Boom (for X5 Belt Version-Black anodized)
208379-X5 Tail Output Shaft with Pulley