It's obvious when you know..........

All in the shape. Try Google pics - the M3W looks the same.

Try this: http://www.talkmorgan.com/ubbthreads.php/topics/83675/1

Note the two concentric rings at the bellhousing end.

DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4