RC HPI R40 M19x0.8 Speed CW Locking Nut Aluminum Purple (1) 87083

HPI 2-Speed Lock Nut (Counterclockwise Threaded)

HPI Racing 2-Speed Lock Nut M19x0.8 (#87083)

HPI Nitro RS43 22Tx12mm (1M) Orange Threaded 2-Speed Pinion Gear HPI106631

HPI 76969 Threaded Pinion Gear (19T * 16mm) (1M/2nd Gear/2 Speed)

HPI Racing Threaded Pinion Gear 21Tx12mm (0.8M/1ST/2 Speed) HPI77011

HPI Racing 77042 Spur Gear 52 Tooth for Light Weight 2 Speed Transmission R40

HPI RS4 Nitro 3 19T Threaded Aluminum Pinion Gear HPI76979