If you want it removable you could use a rubber gasket material (possibly get it at an auto store by the sheet). I would also use something like stainless allen bolts with washers to help prevent cracking, pluse it would look nice. You could countersink a threaded sleve, kinda like drywall anchors but ones that would hold up in wood.
2006 Jeep Liberty
Adire Audio, Cadence, Clarion, MB Quart
Lv = [(14630000 x R^2) / (Fb^2 x Vb)] - 1.463R
*Vb = vol. in cu"
**R = sq.rt. A / Pi (for square/slot port)