MEASURE a Hifonics HFI 12 for me. whats the exact outside diameter? 12 or 12.5?

It will def be flush mount. But Im painging the box and getting the rings cnc cut, so I was hoping for a bit more exact drawing. Is it actually 12 3/8"? Does anyone have a spec drawing?

 
It never hurts to cut it a little bit smaller cuz you can always make it bigger, but if you cut to big youl have to redo that side. I originally cut my hole for a Rockford p3, then I put a aq hdc3 in the hole (hdc was bigger) and I had to cram it in pretty hard but it fits really snug.

 
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