Locating the casting number on a Yamaha 200HP outboard motor

[Frisk151]

I working to help a friend locate a replacement powerhead for a 2006 Yamaha 200HP AET V6, and I need the casting number for the engine, I've been told.

Could anyone point me (and thus them) in the right direction on where this would be located. The engine is located in Mexico if there is any variation vs. US versions.

Thanks,
David