Compare the joining face for the B16 and later box. I'm not sure if or when the B16 bell housing changed to fit the later box. They probably didn't need to change it until the B18 came. That has the starter on the other side.
This issue has come up when the question of fitting an M41 to the PV with a B16. I think it's been done but needs some mods to the box/bell housing interface.
Will the innards from your spare M40 fit in your B16 one? That's another question.
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