Spur Gear (48t steel CNC lightened) made by Tekno RC TKR5415C Spur Gear (48t, steel, CNC, lightened) Vehicle Compatibility TKR5415C - Spur Gear (48t, steel, CNC, lightened) is included with the NB48.4 kit and can be used as a replacement part for that vehicle. This can be used with the NB48.3 and NT48.3 vehicles and should be a direct replacement for the stock part or used as a new feature. Please use the instruction manual for the kit(s) listed to verify compatibility and no additional items are necessary before purchasing.