Question is, will these fit in the underseat FoxBox made for a '07 Supercrew? Anybody tried?

Mounting depth is the issue i'm wondering about.

 

If you are looking for a box that fits great and sounds amazing try ProBox rocks dual 10 downfire box.

 

I personally have 2 sa-10's in a prefab box and honestly unless they each have over a cube you're going to get great mid response but anything really deep wont play loud if at all. also the rattle will be crazy with the downfire unless you have deadening. My SA's are on 1200 watts and still cant hit the lows with the 0.85 cubes the box gives each of them.