Not sure I understood which if the visors you were on about, so I did both:
.
.
Main Visor:
red line widest point: 14.5 inches
blue line height: 6.75 inches
yellow line attach points: 10.5 inches
green line space on headliner: 15 inches
.
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.
.
Small Visor:
red line widest point: 12 inches
blue line height: 6 inches
This visor is attached via what appears to be a holder that is glued on, but it's so tightly held,
that I suspect that is has bolts on the other side. AND, knowing Infniti, you probably need to
remove the entire windscreen to get to them, LOL.
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Hope this helps!