XXX Mount hole diameter?

[Omarvelous 10+ year member]

Getting my first XXX sub on Wed.

Want to know ahead of time, so when it comes can mount it, test it, and finish my box.

Was wondering if anyone knew the exact diameter of the mount holes?

Was thinking of getting 5/16 tnuts and allen head screws, think they will work?

Let me know!!

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[Omarvelous 10+ year member]

Not the actual mount hole, but the screw holes for the XXX.

Will be using tnuts and allen head screws, as mentioned above.