In this case the four, five and six speeds are all from BMW Mxx series engines, they just bolt up. You sometimes have to play with the clutch and flywheel combo to match the splines. The SMG is a whole different game. though. It's from behind a S85 V-10, not the same bell pattern as the M4x and M5x 4 and 6 cyl. It's going to take an adapter and crazy clutch matching. But that's the easy part. This SMG is totally computer and solenoid controlled. Adapting those electronics into a non-CAN E36 (M Roadster) will be..... interesting. And probably well beyond my capabilities and/or desire.