My 2 cents is the NB back plate is the ideal thing to measure. It lines up with the mobo correctly, and has tiny holes to give you a better sence of what ASUS'es intended center spot was, for each hole.
Okay,
X38 ASUS NB blackplate, virner tips in the thread holes
Measuring diagonly
Acorss the NB core hole to hole like an X - 63.37mm
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