Gearbox adapter CNC made of ultra-durable 2017A duralumin and then hand finished. High precision and fit guaranteed. Engine: Audi 4.2 V8 (ABZ) Gearbox: BMW GS6-53DZ (530D 6-speed M57N / M57N2) Gearbox adapter Made by CNC technology from ultra-durable 2017A duralumin, then hand finished. High precision and fitting are guaranteed. Engine: Audi 4.2 V8 (ABZ) Transmission: BMW GS6-53DZ (530D 6-speed M57N / M57N2)