Sorry yes, I did mean W3s... I said 2 because they're the V2 subs. I know they will fit as that's what was in it before.
I just looked... and it'll be close, but the W7s may have enough room in there. That box is fiberglassed so it gives as much room as possible for them.
Also, I know the W6s will fit as they take just a hair more then the W3s do.