Gearbox adapter CNC made from ultra-durable 2017a duralumin then hand finished High precision and fit guaranteed Motor: Mitsubishi 4G63 Gearbox: Mazda RX-8, 5 and 6 speed Gearbox adapter CNC made from ultra durable 2017a duralumin, then hand finished. Guaranteed high precision and perfect fit. Engine: Mitsubishi 4G63 Gearbox: Mazda RX-8, 5 and 6 speed gears.